यदि $\cos A + \cos B = \cos C$ और $\sin A + \sin B = \sin C$ है,तो व्यंजक $\frac{\sin(A + B)}{\sin 2C}$ का मान क्या है?

  • A
    $0$
  • B
    $1$
  • C
    $2$
  • D
    $3$

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