જો $A+B+C=4S$ હોય,તો $\cos (2S-A)+\cos (2S-B)-\cos (2S-C)-\cos 2S=$

  • A
    $4 \cos \frac{A}{2} \cos \frac{B}{2} \cos \frac{C}{2}$
  • B
    $4 \cos \frac{A}{2} \sin \frac{B}{2} \sin \frac{C}{2}$
  • C
    $4 \sin \frac{A}{2} \cos \frac{B}{2} \sin \frac{C}{2}$
  • D
    $4 \sin \frac{A}{2} \sin \frac{B}{2} \cos \frac{C}{2}$

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