$\frac{1}{2}{\cos ^{ - 1}}\left( {\frac{{1 - x}}{{1 + x}}} \right) = $

  • A
    ${\cot ^{ - 1}}\sqrt x $
  • B
    ${\tan ^{ - 1}}\sqrt x $
  • C
    ${\tan ^{ - 1}}x$
  • D
    ${\cot ^{ - 1}}x$

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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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यदि $0 < x < 1$ है,तो $\cot ^{-1}\left( \frac{2x^2 - 1}{2x\sqrt{1 - x^2}} \right)$ का मान ज्ञात कीजिए।

यदि $x>0, y>0, z>0, xy+yz+zx < 1$ और यदि $\tan^{-1} x + \tan^{-1} y + \tan^{-1} z = \pi$ है, तो $x+y+z$ का मान क्या होगा?

यदि $2 \tan^{-1}(\cos x) = \tan^{-1}(\csc^2 x)$ है,तो $x =$

प्रति-त्रिकोणमितीय फलनों के मुख्य मानों को ध्यान में रखते हुए,$\frac{3}{2} \cos ^{-1} \sqrt{\frac{2}{2+\pi^2}}+\frac{1}{4} \sin ^{-1} \frac{2 \sqrt{2} \pi}{2+\pi^2}+\tan ^{-1} \frac{\sqrt{2}}{\pi}$ का मान ज्ञात कीजिए।

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