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

  • A
    $f_5\left(\frac{\pi}{16}\right) = 1$
  • B
    $f_4\left(\frac{\pi}{16}\right) = 1$
  • C
    $f_3\left(\frac{\pi}{16}\right) = 1$
  • D
    $f_2\left(\frac{\pi}{16}\right) = 1$

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