જો $\cos (A - B) = \frac{3}{5}$ અને $\tan A \tan B = 2$ હોય,તો

  • A
    $\cos A \cos B = \frac{1}{5}$
  • B
    $\sin A \sin B = - \frac{2}{5}$
  • C
    $\cos A \cos B = - \frac{1}{5}$
  • D
    $\sin A \sin B = - \frac{1}{5}$

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ધારો કે $\tan \alpha = \frac{a}{a+1}$ અને $\tan \beta = \frac{1}{2a+1}$, તો $\alpha + \beta$ શું થાય?

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