3.Trigonometrical Ratios, Functions and Identities
easy

$\frac{1}{{\tan 3A - \tan A}} - \frac{1}{{\cot 3A - \cot A}} = $

A

$\tan A$

B

$\tan 2A$

C

$\cot A$

D

$\cot 2A$

Solution

(d) $\frac{1}{{\tan 3A – \tan A}} – \frac{1}{{\cot 3A – \cot A}}$

$=\frac{1}{{\tan 3A – \tan A}} + \frac{{\tan A\tan 3A}}{{\tan 3A – \tan A}}$

$= \frac{1}{{\tan 2A}} = \cot 2A$.

Standard 11
Mathematics

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