Question

what is the value of cos3theta
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Answer 1

Answer:

The value of cos3theta is given here in the attatched picture.

Step-by-step explanation:

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Answer 2

Answer:

4cos^{3}\Theta -3cos\Theta

Step-by-step explanation:

As we have given in the question we need to find that the value of $cos3\theta$

This is the direct identity formula given in the book of class 12th N.C.E.R.T

In this formula, at the place of theta, We put the value of the angle which is multiplied by 3 after that

Say if theta=30°, It is multiplied by 3, Now it becomes 90°

Therefore we would solve it by using cos 90

Therefore our final formula is

cos3\Theta=4cos^{3}\Theta -3cos\Theta