$2\cos x - \cos 3x - \cos 5x = $

  • A
    $16\cos^3 x \sin^2 x$
  • B
    $16\sin^3 x \cos^2 x$
  • C
    $4\cos^3 x \sin^2 x$
  • D
    $4\sin^3 x \cos^2 x$

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