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

  • A
    $\frac{1}{2}$
  • B
    $1$
  • C
    $2$
  • D
    $\frac{1}{4}$

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