જો $\theta+\phi=\alpha$ અને $\tan \theta=k \tan \phi$ (જ્યાં $k>1$) હોય,તો $\sin (\theta-\phi)$ નું મૂલ્ય શું થાય?

  • A
    $k \tan \phi$
  • B
    $\sin \alpha$
  • C
    $\left(\frac{k-1}{k+1}\right) \sin \alpha$
  • D
    $k \cos \phi$

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