Question
$\tan 5x\tan 3x\tan 2x = $
$\Rightarrow \tan 5x = \tan (3x + 2x)$
==> $\tan 5x = \frac{{\tan 3x + \tan 2x}}{{1 - \tan 3x\tan 2x}}$
==>$\tan 5x - \tan 5x\tan 3x\tan 2x = \tan 3x + \tan 2x$
==> $\tan 5x\tan 3x\tan 2x = \tan 5x - \tan 3x - \tan 2x$.
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