Question:
Mark $(\sqrt{)}$ against the correct answer in the following:
$\int_{-\pi}^{\pi} x^{3} \cos ^{3} x d x=?$
A. $\pi$
B. $\frac{\pi}{4}$
C. $2 \pi$
D. 0
Solution:
If $\mathrm{f}$ is an odd function,
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