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$\sqrt{2+\sqrt{2+2 \cos 4 \theta}} = $

$\sqrt{\frac{1 - \sin A}{1 + \sin A}} = $

$\cos 20^\circ \cos 40^\circ \cos 80^\circ = $

यदि $L = \sin^{2}\left(\frac{\pi}{16}\right) - \sin^{2}\left(\frac{\pi}{8}\right)$ और $M = \cos^{2}\left(\frac{\pi}{16}\right) - \sin^{2}\left(\frac{\pi}{8}\right)$ है,तो निम्नलिखित में से कौन सा सही है?

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

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