$\begin{align*} \int^{-\pi/2}_{-3\pi/2} [(x+\pi)^3 + \cos^2 (x+3\pi)] dx \end{align*}$ is equal to :

Question

( A ) $(\frac{\pi^4}{32}) +( \frac{\pi}{2})$
( B ) $(\frac{\pi}{4}) - 1$
( C ) $\frac{\pi^4}{32}$
( D ) $\frac{\pi}{2}$