$\tan ^{-1} \frac{9}{10}$

$\tan ^{-1} \frac{18}{19}$

$\tan ^{-1} \frac{3}{191}$

$\tan ^{-1} \frac{6}{205}$

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

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

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

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

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

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

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

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