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निम्नलिखित सर्वसमिकाओं में से कौन सा कथन सत्य है?

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

यदि $\sin \theta = \frac{3}{5}$ और $\theta$ प्रथम चतुर्थांश में नहीं है,तो $15 \sin 2 \theta - 20 \cos 2 \theta - 7 \tan 2 \theta = $

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

$\cos^3 \frac{\pi}{8} \cos \frac{3\pi}{8} + \sin^3 \frac{\pi}{8} \sin \frac{3\pi}{8} = $

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