Mathematics

Problem

Find the value of

\tan 2x

expressed only in terms of

\tan x

. a)

\displaystyle \frac{1-\tan^{2}x}{2\tan x}

\displaystyle \frac{2\tan x}{1-\tan^{2}x}

\displaystyle \frac{2\tan x}{1+\tan^{2}x}

\displaystyle \frac{2}{1-\tan^{2}x}