$\tan ^{-1}\left(\frac{\sqrt{1+x^2}-\sqrt{1-x^2}}{\sqrt{1+x^2}+\sqrt{1-x^2}}\right)$ નું $\cos ^{-1} x^2$ ની સાપેક્ષે વિકલન શું થાય?

  • A
    $-\frac{1}{2}$
  • B
    $-1$
  • C
    $\frac{1}{2}$
  • D
    $1$

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