$\alpha, \beta \in \left(0, \frac{\pi}{2}\right)$ માટે,ધારો કે $3 \sin (\alpha+\beta)=2 \sin (\alpha-\beta)$ અને એક વાસ્તવિક સંખ્યા $k$ એવી છે કે જેથી $\tan \alpha=k \tan \beta$ થાય. તો $k$ ની કિંમત શોધો:

  • A
    $-\frac{2}{3}$
  • B
    $-5$
  • C
    $\frac{2}{3}$
  • D
    $5$

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$\cos \alpha \sin (\beta - \gamma ) + \cos \beta \sin (\gamma - \alpha ) + \cos \gamma \sin (\alpha - \beta ) = $

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