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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