यदि $A+B+C=2S$ है,तो $\sin(S-A) \cos(S-B) - \sin(S-C) \cos S =$

  • A
    $\cos A \sin B \sin C$
  • B
    $\sin A \cos B \cos C$
  • C
    $\cos A \sin B$
  • D
    $\sin A \cos B$

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