यदि $\tan ^{-1} \frac{x-1}{x-2}+\tan ^{-1} \frac{x+1}{x+2}=\frac{\pi}{4}$ है,तो $x$ का मान ज्ञात कीजिए।

  • A
    $\pm \frac{1}{\sqrt{3}}$
  • B
    $\pm \frac{1}{\sqrt{2}}$
  • C
    $\pm \frac{1}{2}$
  • D
    $\pm \frac{\sqrt{3}}{2}$

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$\tan ^{-1} \sqrt{3} - \cot ^{-1}(-\sqrt{3}) = $ . . . . . . .

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यदि $\sin ^{-1}\left(\frac{3}{5}\right)+\cos ^{-1}\left(\frac{12}{13}\right)=\sin ^{-1} \alpha$ है,तो $\alpha=$

$\sin \left[\tan ^{-1}\left(\frac{1-x^2}{2 x}\right)+\cos ^{-1}\left(\frac{1-x^2}{1+x^2}\right)\right]$ का मान है

$\cot \left(\sum\limits_{n=1}^{50} \tan ^{-1}\left(\frac{1}{1+n+n^{2}}\right)\right)$ का मान ज्ञात कीजिए।

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