Question

What is the integral of `cos^(2)3x dx`?

Answer 1

`1/2(1/6sin6x +x) +c`

Explanation:

`int (cos3x)^2 dx`

=`int 1/2(cos6x +1) dx`

=`1/2intcos 6x+1 dx`

=`1/2(1/6sin6x +x) +c`