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।

  • A
    $x^3$
  • B
    $\sqrt{x}$
  • C
    $x$
  • D
    $x^2$

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यदि ${({\tan ^{ - 1}}x)^2} + {({\cot ^{ - 1}}x)^2} = \frac{{5{\pi ^2}}}{8}$ है,तो $x$ का मान ज्ञात कीजिए।

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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।

$\tan ^{-1}(\cot x)+\cot ^{-1}(\tan x) =$ . . . . . .

यदि ${\sin ^{ - 1}}\left( {\frac{{2a}}{{1 + {a^2}}}} \right) + {\sin ^{ - 1}}\left( {\frac{{2b}}{{1 + {b^2}}}} \right) = 2{\tan ^{ - 1}}x,$ तो $x = $

$\cos ^{-1}\left\{\frac{1}{\sqrt{2}}\left(\cos \frac{9 \pi}{10}-\sin \frac{9 \pi}{10}\right)\right\}$ का मान ज्ञात कीजिए।

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