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$\cot \theta - \tan \theta - 2 \tan 2 \theta - 4 \tan 4 \theta = $

यदि $\cos ^3 x \sin 4 x = \sum_{r=0}^{n} a_{r} \sin rx$ सभी $x \in R$ के लिए है,तो $a_3+a_5 : a_1+a_7 = $

सिद्ध कीजिए कि: $\cos 6x = 32 \cos^6 x - 48 \cos^4 x + 18 \cos^2 x - 1$

$\tan A + 2 \tan 2A + 4 \tan 4A + 8 \cot 8A = $

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

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