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When we talk about calculus, we frequently notice that limits and continuity have a distinct and essential position due to their extremely different and important notions. The term limit, on the one hand, refers to the number that a function approaches, whereas the term function can be continuous or discontinuous. Positive discontinuity, Jump discontinuity, and Infinite discontinuity are the three types of discontinuity that fit into this category. We'll go through this topic in-depth with the help of solved examples in this part.

Limits and Derivatives

Evaluating Limit

Algebra of limits

L’Hospital Rule

Function

Continuity and Differentiability

Continuity and Differentiability Properties and Formula

Limits Properties and Formula

Intermediate Value Theorem

Application of Derivatives

Maxima and Minima

Rolle’s Theorem and Lagrange’s Mean Value Theorem

The value obtained by a function f(x) at a point x=a is the value obtained by the function at a point very close to x=a.

Consider the limit of a real-valued function ‘f’ and a real number ‘a’, which is generally say that, \[\underset{x \to a}{\lim} f(x) = L\] if there is a number $\delta$ for every number $\epsilon$ such that $|f(x)-L| < \epsilon$ whenever $0 < |x-a| < \delta$

Left Hand Limit - When a limit is described in terms of a number smaller than a, it is referred to as a left hand limit. It's written as $x \to a^{-}$, which is the same as $x=a-h$ with $h > 0$ and $h \to 0$.

Right Hand Limit - When a limit is described in terms of a number greater than a, it is referred to as a right hand limit. It is written as $x \to a^{+}$, which is the same as $x=a+h$ with $h > 0$ and $h \to 0$.

Existence of Limit - A function's limit at $x = a$ exists only if both its left and right hand limits exist, are equal, and have a finite value, i.e., $\underset{x \to a^{-}}{\lim} f(x) = \underset{x \to a^{+}}{\lim} f(x)$

A function may reach one of two limits. One in which the variable approaches its limit by taking values that are greater than the limit, and the other in which the variable approaches its limit by taking values that are smaller. The limit is not stated in this situation, although the right and left-hand limitations do exist.

When the $\underset{x \to a}{\lim} f(x) = A^{+}$ is used, the values of f near x to the right of ‘a’ are used. The right hand limit of f(x) at ‘a’ is stated to be this value.

When the $\underset{x \to a}{\lim} f(x) = A^{-}$ is used, the values of f near x to the left of ‘a’ are used. The left hand limit of f(x) at ‘a’ is referred to as this value.

The function’s limit exists if and only if the left-hand limit is equal to the right-hand limit.

$\underset{x \to 0}{\lim} \dfrac{\sin x}{x}=1$

$\underset{x \to 0}{\lim} \cos x=1$

$\underset{x \to 0}{\lim} \dfrac{\tan x}{x}=1$

$\underset{x \to 0}{\lim} \dfrac{1-\cos x}{x}=0$

$\underset{x \to 0}{\lim} \dfrac{\sin x^{\circ}}{x}=\dfrac{\pi}{180}$

$\underset{x \to a}{\lim} \dfrac{x^{n}-a^{n}}{x-a}=n a^{n-1}$

$\underset{x \to \infty}{\lim}\left(1+\dfrac{k}{x}\right)^{m x}=e^{m k}$

$\underset{x \to 0}{\lim}(1+x)^{\dfrac{1}{x}}=e$

$\underset{x \to 0}{\lim} \dfrac{\left(a^{x}-1\right)}{x}=\ln a$

$\underset{x \to 0}{\lim} \dfrac{e^{x}-1}{x}=1$

$\underset{x \to 0}{\lim} \dfrac{\ln (1+x)}{x}=1$

$\underset{x \to \infty}{\lim} x^{\dfrac{1}{x}}=1$

If the supplied limit $\underset{x \to a}{\lim} \dfrac{f(x)}{g(x)}$ is of the form $\dfrac{0}{0}$ or $\dfrac{\infty}{\infty}$, that is, both f(x) and g(x) are 0 or both f(x) and g(x) are infinity, then the limit can be solved using the L'Hospital Rule that is,

$\underset{x \to a}{\lim} \dfrac{f(x)}{g(x)} = \underset{x \to a}{\lim} \dfrac{f^\prime(x)}{g^\prime(x)}$, where $f^\prime(x)$ and $g^\prime(x)$ is obtained by differentiating f(x) and g(x).

The continuity of a function and the differentiability of a function are mutually exclusive. Before it can be shown for its differentiability at x = a, the function y = f(x) must first be proved for its continuity at x = a. Both continuity and differentiability can be demonstrated geometrically and algebraically.

The graph y = f(x) of a function is said to be continuous over a range if it is a single unbroken curve (the graph can be drawn easily without lifting the pencil at a point).

Image: Graph of function y = f(x)

Technically we can say that, a continuous real valued function f(x) exists and is equal to $f(x_0)$ at a point $x=x_0$ in the domain if $\underset{x \to x_0}{\lim} f(x)$ exists and is equal to $f(x_0)$.

If a function f(x) is continuous at $x=x_0$, then $\underset{x \to x_0^{+}}{\lim} f(x) = \underset{x \to x_0^{-}}{\lim} f(x) = \underset{x \to x_0}{\lim} f(x)$

Discontinuous functions are those that are not continuous.

The derivative of a real valued function f(x) with respect to x if the derivative $f^\prime(a)$ exists at every point in its domain, which is defined as

$\underset{h\to 0}{\lim} \dfrac{f(x+h)-f(x)}{h}$

Image: Derivative of a function f(x)

If the derivative of a function exists at all points in its domain, the function is said to be differentiable. To test the differentiability of a function at x=c, $\underset{h\to 0}{\lim} \dfrac{f(c+h)-f(c)}{h}$ must exist.

Thus we can say that every differentiable function is continuous

Note: If a function is differentiable at a given point, it is also continuous at that same point. But just because a function is continuous at a point doesn't mean it's also differentiable at that point.

Derivative of Composite Function

In Layman’s terms, to differentiate a composite function at any point in its domain, first differentiate the outer part (i.e., the function enclosing some other function) and then multiply it with the inner function’s derivative function. This will provide us with the desired differentiation.

Derivatives of Implicit Functions

When the dependent variable in a function is not explicitly isolated on either side of the equation, the function is referred to as an implicit function.

Derivatives of Inverse Trigonometric Functions

The derivatives of inverse trigonometric functions are known as inverse trigonometric derivatives. The inverses of the six basic trigonometric functions are called inverse trigonometric functions. Inverse trigonometric derivatives are defined only in the domain of inverse trigonometric functions, as follows:

Inverse Trigonometric Function | Domain |

arcsin x | $\left[-1, 1\right]$ |

arccos x | $\left[-1, 1\right]$ |

arctan x | R |

arccosec x | $(-\infty, -1] \cup [1, \infty)$ |

arcsec x | $(-\infty, -1] \cup [1, \infty)$ |

arccot x | R |

Derivatives of Exponential Functions

The product of the exponential function ax and the natural log of a, $f^\prime(x) = ax~ln ~a$, is the derivative of the exponential function $f(x) = ax$, $a > 0$. The exponential function's derivative is written as $\dfrac{d(ax)}{dx} = (ax)^\prime = ax~ln~a$. The first principle of differentiation and the formulas of limits can be used to calculate the derivative of an exponential function. When $a > 1$ and when $a < 1$, the graph of the exponential function's derivative changes direction.

Formula for derivative of exponential function is given as,

$f(x) = ax, f^\prime(x) = ax~ln~a$ or $\dfrac{d(ax)}{dx} = ax~ln~a$

$f(x) = ex, f^\prime(x) = ex$ or $\dfrac{d(ex)}{dx} = ex$

Derivatives of Logarithmic Functions

The slope of the tangent to the curve representing the logarithmic function is determined by the logarithmic function's derivation. The following is the formula for the derivative of the common and natural logarithmic functions.

$\dfrac{1}{x}$ is the derivative of $ln x$. For example, $\dfrac{d}{dx} \dfrac{1}{x} = ln x$

$\dfrac{1}{x(x ~log~ a)}$ is the derivative of $log_a x$

Derivatives of Functions in Parametric Forms

There are times when we define a function using the third variable rather than explicitly or implicitly defining it. This is a parametric form, which is when a function y(x) is represented by a third variable called the parameter.

$\dfrac{d^2y}{dx^2} = \dfrac{d}{dx}\left(\dfrac{dy}{dx}\right) = \dfrac{\dfrac{d}{dt} \left(\dfrac{dy}{dx}\right)} {\dfrac{dx}{dt}}$

1. $f(x)$ is continuous at $x=a$ if $\lim _{x \rightarrow a-} f(x)=\lim _{x \rightarrow a+} f(x)=f(a)$

2. $\dfrac{d}{d x}\left(x^{n}\right)=n x^{n-1}$ i.e $\dfrac{d}{d x}(\mathrm{x})=1$.

3. $\dfrac{d}{d x}(\sin x)=\cos x$.

4. $\dfrac{d}{d x}(\cos x)=-\sin x$.

5. $\cdot \dfrac{d}{d x}(\tan x)=\sec ^{2} x .$

6. $\dfrac{d}{d x}(\cot x)=-\operatorname{cosec}^{2} x$.

7. $\dfrac{d}{d x}(\sec x)=\sec x \tan x$.

8. $\dfrac{d}{d x}(\operatorname{cosec} x)=-\operatorname{cosec} x \cot x$.

9. $\dfrac{d}{d x}\left(\sin ^{-1} x\right)=\dfrac{1}{\sqrt{1-x^{2}}}$

10. $\dfrac{d}{d x}\left(\cos ^{-1} x\right)=-\dfrac{1}{\sqrt{1-x^{2}}}$

11. $\dfrac{d}{d x}\left(\tan ^{-1} x\right)=\dfrac{1}{1+x^{2}}$

12. $\dfrac{d}{d x}\left(\cot ^{-1} x\right)=-\dfrac{1}{1+x^{2}}$.

13. $\dfrac{d}{d x}\left(\sec ^{-1} x\right)=\dfrac{1}{x \sqrt{x^{2}-1}}$

14. $\dfrac{d}{d x}\left(\operatorname{cosec}^{-1} x\right)=-\dfrac{1}{x \sqrt{x^{2}-1}}$

Theorem 1: If two functions f(x) and g(x) are continuous at a real valued function and continuous at a point x = c, we have:

At the point $c = c$, $f(x) + g(x)$ is continuous.

At $x = c$, $f(x) - g(x)$ is continuous.

Also at $x = c$, $g(x) \cdot g(x)$ is continuous.

At $x = c$, $\dfrac{f(x)}{g(x)}$ is continuous if $g(c) \neq 0$.

Theorem 2: The composite function fog(x) is defined at x = c for two real-valued functions f(x) and g(x). If the function f(x) is continuous at g(c) and g(x) is continuous at x = c, then fog(x) is continuous at x = c.

Theorem 3: If a function f(x) is differentiable at x = c, it is also continuous at that point. Every differentiable function is continuous, in other words.

Theorem 4: Chain Rule - $f = vou$ for a real-valued function f(x) is a composite of two functions u and v. Also, if $t = u(x)$ and both $\dfrac{dt}{dx}$ and $\dfrac{dv}{dt}$ exist, then $\dfrac{df}{dx} = \dfrac{dv}{dt}\cdot dt \cdot dx$ is obtained.

Theorem 5: The derivative of $e^x$ with respect to $x$ is $e^x$. And the derivative of $log x$ with respect to $x$ is $\dfrac{1}{x}$.

Theorem 6: Rolle's Theorem - If a function f(x) is continuous across the interval $\left[a, b\right]$ and differentiable across the interval (a, b), such that f(a) = f(b), and a, b are some real numbers. Then there exists a point c in the interval $\left[a, b\right]$ such that $f^\prime(c) = 0$.

Theorem 7: Mean Value Theorem - If a function f(x) is continuous across the interval $\left[a, b\right]$ and differentiable across the interval (a, b), then there exists a point c in the interval $\left[a, b\right]$ such that $f^\prime(c) = \dfrac{f(b) - f(a)}{b - a}$.

1. Rate of Change Formula

The rate of change function represents the rate at which one quantity changes in relation to another. Simply put, the rate of change is the difference between the amount of change in one item and the corresponding amount of change in another.

i.e., $\dfrac{\Delta y}{\Delta x} = \dfrac{y_2 - y_1}{x_2 - x_1}$

For a linear function

$\dfrac{\Delta y}{\Delta x} = \dfrac{f(b) - f(a)}{b - a}$

Note:

The rate of change of quantity, $\dfrac{dy}{dx}$, is represented by a positive sign when it increases.

The rate of change of quantity, $\dfrac{dy}{dx}$, is represented by a negative sign when it decreases.

2. Increasing and Decreasing Functions

If the value of y increases as the value of x increases, then the function $y = F(x)$ is known as an increasing function, and if the value of y decreases as the value of x increases, then the function $y = F(x)$ is known as a decreasing function.

Image: Increasing and Decreasing Function

3. Maxima and Minima of Functions

The extrema of a function are its maximum and minimum values. The maximum and minimum values of a function within a given set of ranges are known as maxima and minima. The maximum value of the function under the entire range is known as the absolute maxima, and the minimum value is known as the absolute minima.

In the diagram below, we get maximum values of the function at x = a and x = 0, and minimum values of the function at x = b and x = c. The maxima are all the peaks, and the minima are all the valleys.

Image: Maxima and Minima

4. Tangents and Normals

A tangent to a curve is a line that touches it at one point and has the same slope as the curve.

A line perpendicular to a tangent to the curve is called a normal to the curve.

Image: Tangent and Normal

Example on Limit:

Evaluate $\underset{x\to 0}{\lim} \dfrac{x\cos{(x)}-\sin{(x)}}{x^2\sin{(x)}}$

Solution: Here the given limit is of the form $\dfrac{0}{0}$

Using L’Hospital Rule and differentiating, we get

$\Rightarrow \underset{x \to 0}{\lim} \dfrac{\cos{(x)}-x\sin{(x)}-\cos{(x)}}{x^2\cos{(x)} + 2x\sin{(x)}}$

$\Rightarrow \underset{x \to 0}{\lim} \dfrac{-\sin{(x)}}{x\cos{(x)} + 2\sin{(x)}}$

$\Rightarrow \underset{x \to 0}{\lim} \dfrac{\dfrac{-\sin{(x)}}{x}}{\cos{(x)} + \dfrac{2\sin{(x)}}{x}}$

$\Rightarrow \dfrac{-1}{1 + 2(1)}$

$\Rightarrow \dfrac{-1}{3}$

Example on Continuity:

Find the continuity of the function f(x) = 3x + 4 at the point x = 5.

Solution: The given function is f(x) = 3x + 4, and its value at the point x = 5 is f(5) = 19.

Let us find the limit of the function at the point x = 5.

$\underset{x \to 5}{\lim}f(x)$

$\Rightarrow \underset{x \to 5}{\lim} (3x + 4) $

$\Rightarrow 3(5) + 4 $

$\Rightarrow 15 + 4 = 19 = f(5)$

Therefore, the function f(x) is continuous at the point x = 5.

1. If $f(1)=1, f^{\prime}(1)=2$ then $\underset{x \rightarrow 1}{\lim} \dfrac{\sqrt{f(x)}-1}{\sqrt{x}-1}$ is

Ans: Given function is $\underset{x \rightarrow 1}{\lim} \dfrac{\sqrt{f(x)}-1}{\sqrt{x}-1}$ and the limit is of the form (0/0)

Using L’Hospital's rule we get,

$\Rightarrow \underset{x \rightarrow 1}{\lim} \dfrac{\dfrac{1}{2 \sqrt{f(x)}} f^{\prime}(x)}{\dfrac{1}{2 \sqrt{x}}}$

$\Rightarrow \dfrac{f^{\prime}(1)}{\sqrt{f(1)}}$

As it is given that $f(1)=1, f^{\prime}(1)=2$

Hence $ \dfrac{f^{\prime}(1)}{\sqrt{f(1)}}=2$

2. $f(x)$ and $g(x)$ are two differentiable functions on $\left[0,2\right]$ such that $f^{\prime \prime}(x)-g^{\prime \prime}(x)=0$, $f^{\prime \prime}(1)=2 g^{\prime}(1)=4 f(2)=3 g(2)=9$ then $f(x)-g(x)$ at $x=3 / 2$ is

Ans: Given $f^{\prime \prime}(x)-g^{\prime \prime}(x)=0$

On Integrating the above equation we get,

$f^{\prime}(x)-g^{\prime}(x)=c$; $

$ \Rightarrow f^{\prime}(1)-g^{\prime}(1)=c$

$\Rightarrow 4-2 = c \Rightarrow c=2$

$\therefore f^{\prime}(x)-g^{\prime}(x)=2$

Again Integrating the above equation to reduce to f(x) and g(x) we get,

$f(x)-g(x)=2 x+c_{1}$

$\Rightarrow f(2)-g(2)=4+c_{1}$

$\Rightarrow 9-3=4+c_{1} ; \Rightarrow c_{1}=2$

$\therefore f(x)-g(x)=2 x+2$ at $x= \dfrac{3}{2}, f(x)-g(x)=3+2=5$.

3. Solve the limit $\underset{x \rightarrow \alpha}{\lim} \dfrac{1-\cos a(x-\alpha)(x-\beta)}{(x-\alpha)^{2}}$

Ans: Given, $\underset{x \rightarrow \alpha}{\lim} \dfrac{1-\cos a(x-\alpha)(x-\beta)}{(x-\alpha)^{2}}$

We know that $1-cos\theta = 2sin^2\theta$

Thus the given equation will become,

$\Rightarrow \lim _{x \rightarrow \alpha} \dfrac{2 \sin ^{2}\left(a \dfrac{(x-\alpha)(x-\beta)}{2}\right)}{(x-\alpha)^{2}}$

$\Rightarrow \lim _{x \rightarrow \alpha} \dfrac{2}{(x-\alpha)^{2}} \times \dfrac{\sin ^{2}\left(a\dfrac{(x-\alpha)(x-\beta)}{2}\right)} {\dfrac{a^{2}(x-\alpha)^{2}(x-\beta)^{2}}{4}}\times \dfrac{a^{2}(x-\alpha)^{2}(x-\beta)^{2}}{4}$

$\Rightarrow \dfrac{a^{2}(\alpha-\beta)^{2}}{2}$

1. Let $f(x)=4$ and $f^{\prime}(x)=4$. Then $\underset{x \rightarrow 2}{\lim} \dfrac{x f(2)-2 f(x)}{x-2}$ is given by

Ans: - 4

Hint: Apply L’Hospital rule

2. If $f(x+y)=f(x) . f(y) \forall x, y$ and $f(5)=2, f^{\prime}(0)=$ 3 then $f^{\prime}(5)$ is

Ans: 6

Hint: Differentiate with respect to x, treating y as constant

Some of the important concepts covered in this chapter include limits, functions, differentiability, continuity, and L’Hospital Rule. It is one of the important chapters in class 12 and it can be continued in higher classes also. Many questions will be asked from this chapter in JEE Main and JEE Advanced both. So the students preparing for JEE must practice the questions from this chapter.

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In order to prepare for JEE Main 2022, candidates should know the list of important books i.e. RD Sharma Solutions, NCERT Solutions, RS Aggarwal Solutions, HC Verma books and RS Aggarwal Solutions. They will find the high quality readymade solutions of these books on Vedantu. These books will help them in order to prepare well for the JEE Main 2022 exam so that they can grab the top rank in the all India entrance exam.

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JEE Main 2022 free online mock test series for exam preparation are available on the Vedantu website for free download. Practising these mock test papers of Physics, Chemistry and Maths prepared by expert teachers at Vedantu will help you to boost your confidence to face the JEE Main 2022 examination without any worries. The JEE Main test series for Physics, Chemistry and Maths that is based on the latest syllabus of JEE Main and also the Previous Year Question Papers.

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NTA is responsible for the release of the JEE Main 2022 June and July Session cut off score. The qualifying percentile score might remain the same for different categories. According to the latest trends, the expected cut off mark for JEE Main 2022 June and July Session is 50% for general category candidates, 45% for physically challenged candidates, and 40% for candidates from reserved categories. For the general category, JEE Main qualifying marks for 2021 ranged from 87.8992241 for general-category, while for OBC/SC/ST categories, they ranged from 68.0234447 for OBC, 46.8825338 for SC and 34.6728999 for ST category.

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JEE Main 2022 June and July Session Result - NTA has announced JEE Main result on their website. To download the Scorecard for JEE Main 2022 June and July Session, visit the official website of JEE Main NTA.

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JEE Main 2022 state rank lists will be released by the state counselling committees for admissions to the 85% state quota and to all seats in NITs and CFTIs colleges. JEE Main 2022 state rank lists are based on the marks obtained in entrance exams. Candidates can check the JEE Main 2022 state rank list on the official website or on our site.

Want to know which Engineering colleges in India accept the JEE Main 2022 scores for admission to Engineering? Find the list of Engineering colleges accepting JEE Main scores in India, compiled by Vedantu. There are 1622 Colleges that are accepting JEE Main. Also find more details on Fees, Ranking, Admission, and Placement.

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FAQ

**1. Mention the most important differentiation of the functions f(x) based on the type of functions.**

Some of the most important differentiation of the functions f(x) based on the type of functions are given below:

Derivative of Composite Function

Derivatives of Implicit Functions

Derivatives of Inverse Trigonometric Functions

Derivatives of Exponential Functions

Derivatives of Logarithmic Functions

Derivatives of Functions in Parametric Forms

**2. What Are the Applications of Calculus Limits in Real Life?**

Limits are also utilized in practice to approximate the calculation of derivatives. Engineers will estimate a function using small changes in the function and then try to determine the derivative of the function using smaller spacing in the function following sample intervals in order to do computations.

**3. Mention two of the most important theorems on continuity and differentiability**

Rolle's Theorem - If a function f(x) is continuous across the interval $\left[a, b\right]$ and differentiable across the interval (a, b), such that f(a) = f(b), and a, b are some real numbers. Then there exists a point c in the interval $\left[a, b\right]$ such that $f^\prime(c) = 0$.

Mean Value Theorem - If a function f(x) is continuous across the interval $\left[a, b\right]$ and differentiable across the interval (a, b), then there exists a point c in the interval $\left[a, b\right]$ such that $f^\prime(c) = \dfrac{f(b) - f(a)}{b - a}$.

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