$1 + \cos 2x + \cos 4x + \cos 6x = $

  • A
    $2\cos x \cos 2x \cos 3x$
  • B
    $4\sin x \cos 2x \cos 3x$
  • C
    $4\cos x \cos 2x \cos 3x$
  • D
    આમાંથી કોઈ નહીં

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