$2{\tan ^{ - 1}}\left( {\frac{1}{3}} \right) + {\tan ^{ - 1}}\left( {\frac{1}{7}} \right) = $

  • A
    ${\tan ^{ - 1}}\left( {\frac{{49}}{{29}}} \right)$
  • B
    $\frac{\pi }{2}$
  • C
    $0$
  • D
    $\frac{\pi }{4}$

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यदि $\sin ^{-1}\left(\frac{2 a}{1+a^2}\right)+\cos ^{-1}\left(\frac{1-a^2}{1+a^2}\right)=\tan ^{-1}\left(\frac{2 x}{1-x^2}\right)$ जहाँ $a, x \in(0,1)$,तो $x$ का मान ज्ञात कीजिए।

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

मान ज्ञात कीजिए: $\tan^{-1}\left(\frac{1}{4}\right) + \tan^{-1}\left(\frac{2}{9}\right) = $

यदि $0 \leq x \leq \frac{1}{2}$ है,तो $\tan \left[\sin ^{-1}\left\{\frac{x}{\sqrt{2}}+\frac{\sqrt{1-x^{2}}}{\sqrt{2}}\right\}-\sin ^{-1} x\right]$ का मान ज्ञात कीजिए।

$\cos ^{ - 1}\frac{4}{5} + \tan ^{ - 1}\frac{3}{5} = $

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