$\int_{0}^{n \frac{\pi}{2}} \cos ^{2} \theta d(\tan \theta)$ এর মান কত?

$\tan \left(n \frac{\pi}{2}\right)$

$\frac{1}{3} \cos ^{3}\left(n \frac{\pi}{2}\right)$

$\frac{\pi}{3} \sin ^{3}\left(n \frac{\pi}{2}\right)$

$\mathbf{n} \pi$

$\mathrm{n} \frac{\pi}{2}$