{rm{cosec }}A - 2cot 2Acos A = | vedclass

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Question

(a) ${\rm{cosec}}\,A - 2\cot 2A\cos A $

$= \frac{1}{{\sin A}} - \frac{{2\cos A\cos 2A}}{{\sin 2A}}$

$ = \frac{1}{{\sin A}} - \frac{{2\cos A\cos

Vedclass · Accepted Answer

$2\sin A$

Vedclass · Answer

(a) ${\rm{cosec}}\,A - 2\cot 2A\cos A $

$= \frac{1}{{\sin A}} - \frac{{2\cos A\cos 2A}}{{\sin 2A}}$

$ = \frac{1}{{\sin A}} - \frac{{2\cos A\cos 2A}}{{2\sin A\cos A}} $

$= \frac{{1 - \cos 2A}}{{\sin A}} $

$= \frac{{2{{\sin }^2}A}}{{\sin A}}$

$ = 2\sin A$.

${\rm{cosec }}A - 2\cot 2A\cos A = $

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