फलन को सरलतम रूप में लिखिए: $\tan ^{-1} \left( \frac{\sqrt{1+x^{2}}-1}{x} \right), x \neq 0$

  • A
    $\frac{1}{2} \sin ^{-1} x$
  • B
    $\tan ^{-1} x$
  • C
    $\frac{1}{2} \cot ^{-1} x$
  • D
    $\frac{1}{2} \tan ^{-1} x$

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यदि ${x^2} + {y^2} + {z^2} = {r^2}$ है,तो ${\tan ^{ - 1}}\left( {\frac{{xy}}{{zr}}} \right) + {\tan ^{ - 1}}\left( {\frac{{yz}}{{xr}}} \right) + {\tan ^{ - 1}}\left( {\frac{{zx}}{{yr}}} \right) = $

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