Question

How do you find the antiderivative of `cos^4 x sin(2x) dx`?

Answer 1

`= -1/3 cos^6x + C`

Explanation:

use `sin 2A = 2 sin A cos A`

it becomes `2 int \ cos^5x sin x \ dx`

`= 2 int -1/6\d/dx( cos^6 x) \ dx`

`= -1/3 cos^6x + C`