
How do you find the value of ?
Answer
472.2k+ views
Hint: Here we can proceed by finding the of the same angle as given and we know that and therefore we can divide both the values of the of the same angle and get the exact value of the .
Complete step by step solution:
Now we are given to find the exact value of
We know that:
Now we can find the relation between to get the value of the
Let us consider the triangle right-angled at
We know that:
We also know that:
Now if we divide the equation (3) and (4) we will get:
Hence we get that:
Now we can compare the equation (5) and (6) to get the required relation between
On comparing both equation (5) and (6) we can say that:
So we know the value of and
Now we know that:
Here putting the value of we get:
Hence by this method we have got the exact value of the given trigonometric function which is
So in order to calculate cotangent of any angle we need to just divide the cosine and sine of the same angle and we will get the tangent of that angle as we know that:
So we get the value of
Note:
Here in these types of problems where we are asked to find the value of the tangent or cotangent of any angle, we must know the basic values of the sine and cosine of the angles like and then we can easily calculate the same angles of the tangent, cotangent, secant, and cosecant of that same angle.
Complete step by step solution:
Now we are given to find the exact value of
We know that:
Now we can find the relation between
Let us consider the triangle

We know that:
We also know that:
Now if we divide the equation (3) and (4) we will get:
Hence we get that:
Now we can compare the equation (5) and (6) to get the required relation between
On comparing both equation (5) and (6) we can say that:
So we know the value of
Now we know that:
Here putting the value of
Hence by this method we have got the exact value of the given trigonometric function which is
So in order to calculate cotangent of any angle we need to just divide the cosine and sine of the same angle and we will get the tangent of that angle as we know that:
So we get the value of
Note:
Here in these types of problems where we are asked to find the value of the tangent or cotangent of any angle, we must know the basic values of the sine and cosine of the angles like
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