$\int_{0}^{\frac{\pi}{2}} x^{4} \cos x d x=$ কত ?

$\frac{\pi^{4}}{16}+24$

$\frac{\pi^{4}}{16}-3 \pi^{2}+24$

$\frac{-\pi^{2}}{2}+12 \pi$

$\frac{\pi^{4}}{16}-\frac{\pi^{3}}{2}-3^{2} \pi+24$