3.Trigonometrical Ratios, Functions and Identities
easy

$\tan 3A - \tan 2A - \tan A = $

A

$\tan 3A\tan 2A\tan A$

B

$ - \tan 3A\tan 2A\tan A$

C

$\tan A\tan 2A - \tan 2A\tan 3A - \tan 3A\tan A$

D

એકપણ નહિ.

Solution

(a) Since $\tan \,\,3A = \frac{{\tan A + \tan 2A}}{{1 – \tan A\,\,\tan 2A}}$

$ \Rightarrow \,\,\tan \,\,3A – \tan \,\,2A – \tan A = \tan \,\,3A\,\tan \,\,2A\,\,\tan A$.

Standard 11
Mathematics

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