यदि $\sin A = \sin B$ और $\cos A = \cos B$ है,तो

  • A
    $\sin \frac{A - B}{2} = 0$
  • B
    $\sin \frac{A + B}{2} = 0$
  • C
    $\cos \frac{A - B}{2} = 0$
  • D
    $\cos (A + B) = 0$

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