$\sin [\cot ^{ - 1}(\cos \tan ^{ - 1}x)] =$

  • A
    $\sqrt{\frac{x^2+1}{x^2+2}}$
  • B
    $\frac{x}{\sqrt{x^2+1}}$
  • C
    $\frac{1}{\sqrt{x^2+2}}$
  • D
    $\sqrt{\frac{x^2+1}{x^2+2}}$

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$x$ ની કિંમત શોધો જેથી $\sin \left(2 \tan ^{-1} \frac{3}{4}\right)=\cos \left(2 \tan ^{-1} x\right)$ થાય.

$4 \tan ^{-1} \frac{1}{5}-\tan ^{-1} \frac{1}{70}+\tan ^{-1} \frac{1}{99}=$

$\frac{d}{dx} \left( \cos^{-1} \sqrt{\frac{1 + \cos x}{2}} \right) = $

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