किसी भी त्रिभुज $ABC$ में,व्यंजक ${\sin ^2}\frac{A}{2} + {\sin ^2}\frac{B}{2} + {\sin ^2}\frac{C}{2}$ किसके बराबर है?

  • A
    $1 - 2\cos \frac{A}{2}\cos \frac{B}{2}\cos \frac{C}{2}$
  • B
    $1 - 2\sin \frac{A}{2}\cos \frac{B}{2}\cos \frac{C}{2}$
  • C
    $1 - 2\sin \frac{A}{2}\sin \frac{B}{2}\sin \frac{C}{2}$
  • D
    $1 - 2\cos \frac{A}{2}\cos \frac{B}{2}\sin \frac{C}{2}$

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