Difference Between Integral and Definite Integrals for JEE Main 2024

A graph's curve's area can be determined using a definite integral. The start and endpoints are its boundaries, within which the area under a curve is determined. To select the area of the curve f(x), with respect to the x-axis, the limit points [a, b] can be used. The equivalent phrase for a definite integral is ∫baf(x)dx.

Integration is the total of the areas, and the size inside bounds is determined using definite integrals.

Integration was first studied in the third century BC when it was used to calculate the areas of circles, parabolas, and ellipses. Let's find out more about definite integrals and their characteristics.

Properties of Definite Integral: 

If a function f is positive, then the definite integral ∫baf(x) dx can be represented as the area under the graph y=f(x), above the x-axis and between x=a and x=b.

This results in the following characteristics, which hold for integrable functions generally as well:

∫aaf(x) dx=0

(This is a vertical line segment's area with no width.)

∫baf(x) dx+∫cbf(x) dx=∫caf(x) dx

(In this case, the two nearby areas are added, and the result is expressed as a single definite integral.)

What is Integral?   

F'(x) = f(x) for all values of x in I. TF(x) is referred to as an antiderivative, Newton-Leibnitz integral, or primitive of a function f(x) on an interval I.

A region's area under a curve is represented by an integral. By drawing rectangles, we can roughly estimate an integral's true value. The area of the region enclosed by the graph of the supplied function between two points on the line can be used to illustrate a definite integral of a function. By dividing a region into small vertical rectangles and adding the lower and upper bounds, the size of the region may be calculated. Over an interval on which the integral is based, we provide an integral of a function.

Types of Integral: 

The following kinds of issues are resolved using integral calculus.

1. A function must be found if its derivative is known.

2. The issue of locating the region confined by the graph of a function under predetermined circumstances. Thus, there are two categories of integral calculus.

• Integrals with definite values (whose values are known in advance)

• Integrals with indefinite values (where C is a random constant and the value of the integral is undefined)

Method to Find Integral: 

The indefinite integrals can be found using a variety of techniques. The common techniques are:

• Integrals can be found using the integration by substitution approach.

• Using integration by parts to find integrals

• Integrals can be found by integrating with partial fractions.

Key Concepts: 

• The area above the x-axis less the area below the y-axis is known as the net signed area, and it may be calculated using the definite integral. 

• Net signed area may be zero, negative, or positive.

• The integrand, the integration variable, and the integration limits are the constituent elements of the definite integral.

• Integrable continuous functions are those on a closed interval. Depending on the type of discontinuities, functions that are not continuous could nevertheless be integrable.

• Integrals can be evaluated using the characteristics of definite integrals.

• Many functions' areas under the curves can be determined using geometric formulas.

• A function's average value can be determined using definite integrals.

Difference Between Integral and Definite Integrals:

The difference between the definite and indefinite integrals solutions is that, in the former, after integrating the given function, we simply obtain a number while, in the latter, we simply integrate the function and add an arbitrary constant. We can determine the value of that arbitrary constant and, thus, a suitable function, using beginning conditions.

Summary

The differentiation of definite integrals is a significant concept in calculus, bridging the gap between integration and differentiation. Understanding this concept is crucial for aspiring mathematicians, scientists, engineers, and anyone working with complex mathematical models. By grasping the applications and techniques involved in differentiating definite integrals, one can unlock the full potential of calculus and apply it effectively to real-world problems. So, the next time you encounter a problem involving varying parameters, remember the power of differentiating definite integrals and its relevance in diverse fields.