यदि $f(x) = \int x^2 \cos^2 x (2x \tan^2 x - 2x - 6 \tan x) dx$ और $f(0) = \pi$ है,तो $f(x) =$

  • A
    $x^2 \sin x + \pi$
  • B
    $\cos x + \pi - 1$
  • C
    $-x^3 \sin 2x + \pi$
  • D
    $x^3 \cos 2x + \pi \cos x$

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