$\cos \alpha \sin (\beta-\gamma) + \cos \beta \sin (\gamma-\alpha) + \cos \gamma \sin (\alpha-\beta)$ का मान क्या है?

  • A
    $0$
  • B
    $\frac{1}{2}$
  • C
    $1$
  • D
    $4 \cos \alpha \cos \beta \cos \gamma$

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