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$\frac{\tan x}{\tan 3x}$ का मान,जब भी परिभाषित हो,कभी भी किसके बीच नहीं होता है?

सिद्ध कीजिए कि: $\cos 4x = 1 - 8 \sin^2 x \cos^2 x$

मान लीजिए $f_n(x) = \tan \frac{x}{2}(1 + \sec x)(1 + \sec 2x) \dots (1 + \sec 2^n x)$, तो

$\tan \left( \frac{\pi }{4} + \theta \right) - \tan \left( \frac{\pi }{4} - \theta \right) = $

यदि $\frac{\tan 3A}{\tan A} = a$ है,तो $\frac{\sin 3A}{\sin A}$ का मान ज्ञात कीजिए।

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