Question

hey anyone can tell me how to integrete cosQdQ?​

Answer 1

Explanation:

The integral of cos(2x) is (1/2)sin(2x) + C, where C is a constant.

cos(2x) = cos^2(x) - sin^2(x). We also know the trig identity sin^2(x) + cos^2(x) = 1, so combining these we get the equation cos(2x) = 2cos^2(x) -1.