यदि $\alpha + \beta - \gamma = \pi ,$ तो ${\sin ^2}\alpha + {\sin ^2}\beta - {\sin ^2}\gamma = $

  • A
    $2\sin \alpha \sin \beta \cos \gamma $
  • B
    $2\cos \alpha \cos \beta \cos \gamma $
  • C
    $2\sin \alpha \sin \beta \sin \gamma $
  • D
    इनमें से कोई नहीं

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