निम्नलिखित सर्वसमिकाओं में से कौन सा कथन सत्य है?

  • A
    $\sin 5 \theta = 16 \cos^4 \theta \sin \theta - 12 \cos^2 \theta \sin \theta + \sin \theta$
  • B
    $\sin 5 \theta = 16 \cos^4 \theta - 12 \cos^2 \theta + 1$
  • C
    $\sin 5 \theta = 16 \cos^4 \theta \sin \theta + 12 \cos^2 \theta \sin \theta - \sin \theta$
  • D
    $\sin 5 \theta = 16 \cos^4 \theta \sin \theta + 12 \cos^2 \theta \sin \theta + \sin \theta$

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$\tan \frac{\pi}{8}$ का मान क्या 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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