$\tan ^{-1} \frac{1}{3}+\tan ^{-1} \frac{1}{5}+\tan ^{-1} \frac{1}{7}+\tan ^{-1} \frac{1}{8}$ का मान $ . . . . . . $ है।

  • A
    $\frac{11 \pi}{5}$
  • B
    $\frac{\pi}{4}$
  • C
    $\pi$
  • D
    $\frac{3 \pi}{4}$

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

मान ज्ञात कीजिए: $\tan^{-1} \left( \frac{1 - x^2}{2x} \right) + \cos^{-1} \left( \frac{1 - x^2}{1 + x^2} \right)$

यदि $\tan ^{-1}\left[\frac{\sqrt{1+x^2}-\sqrt{1-x^2}}{\sqrt{1+x^2}+\sqrt{1-x^2}}\right]=\alpha$ है,तो $\sin 2 \alpha$ का मान ज्ञात कीजिए।

$\operatorname{cosec}\left[2 \cot ^{-1}(5)+\cos ^{-1}\left(\frac{4}{5}\right)\right]$ का मान ..... है।

यदि $y = \tan^{-1} \sqrt{\frac{1 + \cos x}{1 - \cos x}}$ है,तो $\frac{dy}{dx}$ का मान क्या है?

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