કિંમત શોધો: $\sqrt{\sin ^4 x+4 \cos ^2 x}-\sqrt{\cos ^4 x+4 \sin ^2 x}$

  • A
    $1-\cos 2 x$
  • B
    $\tan 2 x$
  • C
    $\sin 2 x$
  • D
    $\cos 2 x$

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