$\cos \left[ {{\cos }^{ - 1}}\left( {\frac{{ - 1}}{7}} \right) + {{\sin }^{ - 1}}\left( {\frac{{ - 1}}{7}} \right) \right] = $

  • A
    $ - 1/3$
  • B
    $0$
  • C
    $1/3$
  • D
    $4/9$

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$\begin{aligned} & \text{यदि } \cot \left(\cos ^{-1} x\right)=\sec \left\{\tan ^{-1}\left(\frac{a}{\sqrt{b^2-a^2}}\right)\right\} \\ & b>a, \text{ तो } x= \end{aligned}$

सिद्ध कीजिए कि $\tan ^{-1} \frac{1}{2}+\tan ^{-1} \frac{2}{11}=\tan ^{-1} \frac{3}{4}$

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

$\cos (\tan ^{ - 1}(\tan 2))$ का मान ज्ञात कीजिए।

यदि $\cos ^{-1} x+\cos ^{-1} y+\cos ^{-1} z=3 \pi$ है, तो

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