यदि $\cos A = \frac{3}{4}$ है,तो $32\sin \frac{A}{2}\cos \frac{5A}{2} = $

  • A
    $\sqrt{7}$
  • B
    $-\sqrt{7}$
  • C
    $7$
  • D
    $-7$

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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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