$\frac{81 \pi}{8}$

$\frac{9 \pi}{2}$

$\pi$

$\frac{\pi}{10}$

0

$\frac{1}{2} \log (2-\sqrt{3})$

$\frac{1}{2} \log (2+\sqrt{3})$

$\frac{1}{2} \log (2 \sqrt{3}-3)$

$\frac{\pi}{\sqrt{2}}$

$\frac{\pi}{2}$

$\sqrt{2} \pi$

$2 \pi$

$\frac{\pi}{8} \log 2$

$-\frac{\pi}{2} \log 2$

$-\frac{\pi}{4} \log 2$

$2 \pi \log 2$