What do you need help with?
Suppose we let
, so that
.
Also, recall the double angle identity for cosine:

So, we can rewrite and compute the integral using the substitution, as





B and C
3^3 = 27
the cubed root of 27 is 3
The domain of this expression is all real numbers except where the expression is unidentified. In this case, there is no real number that makes this expression unidentified.
Ans : 2(-2)-3(3)-(-2) = -11