यदि $A$ और $B$ संपूरक कोण हैं,तो $\sin^{2} \frac{A}{2} + \sin^{2} \frac{B}{2} =$

  • A
    $1$
  • B
    $\frac{1}{3}$
  • C
    $0$
  • D
    $\frac{1}{2}$

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