$\tan \frac{1}{2} \left[ \sin^{-1} \frac{2x}{1+x^2} + \cos^{-1} \frac{1-y^2}{1+y^2} \right]$ ની કિંમત શોધો,જ્યાં $|x | < 1, y>0$ અને $xy < 1$ છે.

  • A
    $\frac{x+y}{1+xy}$
  • B
    $\frac{x-y}{1+xy}$
  • C
    $\frac{x-y}{1-xy}$
  • D
    $\frac{x+y}{1-xy}$

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