Question

What is the integral of `cos^2 6x`?

Answer 1

`1/2( x+1/12 sin 12x)` +C

Explanation:

`cos^2 6x = 1/2 (1+cos 12x)` {identity `cos2x= 2cos^2x -1`}

`int cos^2 6x= int 1/2 (1+cos 12x) dx`

=`1/2( x+1/12 sin 12x)` +C