જો $\cos x + \cos y + \cos \alpha = 0$ અને $\sin x + \sin y + \sin \alpha = 0$ હોય,તો $\cot \left( \frac{x + y}{2} \right) = $

  • A
    $\sin \alpha $
  • B
    $\cos \alpha $
  • C
    $\cot \alpha $
  • D
    $\sin \left( \frac{x + y}{2} \right)$

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જો $x \neq -y$ અને $\sin x + \sin y = 3(\cos y - \cos x)$ હોય,તો $\tan(x - y) =$

પદાવલિ $\frac{\tan A}{1 - \cot A} + \frac{\cot A}{1 - \tan A}$ ને નીચે મુજબ લખી શકાય:

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