यदि $|x|>1$ के लिए,$\tanh ^{-1}\left(\frac{1}{x}\right)+\operatorname{coth}^{-1}(x)=\log _e(f(x))$ है,तो $f(-5)=$

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

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यदि $\sin ^{ - 1}\frac{{2a}}{{1 + {a^2}}} - \cos ^{ - 1}\frac{{1 - {b^2}}}{{1 + {b^2}}} = \tan ^{ - 1}\frac{{2x}}{{1 - {x^2}}}$,तो $x = $

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

यदि $2 \sin ^{-1} x-3 \cos ^{-1} x=4, x \in[-1,1]$ है,तो $2 \sin ^{-1} x+3 \cos ^{-1} x$ का मान ज्ञात कीजिए।

सिद्ध कीजिए कि $\tan ^{-1}\left(\frac{2}{11}\right)+\tan ^{-1}\left(\frac{7}{24}\right)=\tan ^{-1}\left(\frac{1}{2}\right)$

यदि $a=\sin ^{-1}(\sin (5))$ और $b=\cos ^{-1}(\cos (5))$ है,तो $a^2+b^2$ का मान ज्ञात कीजिए।

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