જો $\sin \theta + \sin \phi = a$ અને $\cos \theta + \cos \phi = b$ હોય,તો $\tan \frac{\theta - \phi}{2}$ ની કિંમત શોધો.

  • A
    $\sqrt{\frac{a^2 + b^2}{4 - a^2 - b^2}}$
  • B
    $\sqrt{\frac{4 - a^2 - b^2}{a^2 + b^2}}$
  • C
    $\sqrt{\frac{a^2 + b^2}{4 + a^2 + b^2}}$
  • D
    $\sqrt{\frac{4 + a^2 + b^2}{a^2 + b^2}}$

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