Question

Solve:
$\frac{2\tan {15}^o}{1-{\tan }^2{15}^o}=?$

Answer 1

$\frac{2\tan {15}^{\circ }}{1-{\tan }^2{15}^{\circ }}=\tan (2\times {15}^{\circ })=\tan {30}^{\circ }=\frac{1}{\sqrt{3}}$