${\tan ^{ - 1}}\left[ {\frac{{\sqrt {1 + {x^2}} + \sqrt {1 - {x^2}} }}{{\sqrt {1 + {x^2}} - \sqrt {1 - {x^2}} }}} \right]$,जहाँ $|x| < 1$ और $x \ne 0$ है,का मान क्या होगा?

  • A
    $\frac{\pi }{4} + \frac{1}{2}{\cos ^{ - 1}}{x^2}$
  • B
    $\frac{\pi }{4} + {\cos ^{ - 1}}{x^2}$
  • C
    $\frac{\pi }{4} - \frac{1}{2}{\cos ^{ - 1}}{x^2}$
  • D
    $\frac{\pi }{4} - {\cos ^{ - 1}}{x^2}$

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फलन $f(x) = \sqrt{|\sin^{-1}|\sin x|| - |\cos^{-1}|\cos x||}$ का परिसर ज्ञात कीजिए।

यदि $y = \tan^{-1}\left(\frac{1}{x^2 + x + 1}\right) + \tan^{-1}\left(\frac{1}{x^2 + 3x + 3}\right) + \tan^{-1}\left(\frac{1}{x^2 + 5x + 7}\right) + \dots$ $n$ पदों तक है,तो $\frac{dy}{dx}$ का मान ज्ञात कीजिए।

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सिद्ध कीजिए कि $\tan ^{-1} x+\tan ^{-1} \frac{2 x}{1-x^{2}}=\tan ^{-1}\left(\frac{3 x-x^{3}}{1-3 x^{2}}\right)$,जहाँ $|x| < \frac{1}{\sqrt{3}}$.

कथन-$1$: ${\cot ^{ - 1}}\left[ {\frac{{\log (e/{x^2})}}{{\log (ex^2)}}} \right] + {\cot ^{ - 1}}\left[ {\frac{{\log (ex^2)}}{{\log (e/{x^2})}}} \right] = \frac{\pi}{2}$
कथन-$2$: ${\tan ^{ - 1}}\left[ {\frac{{1 + \log {x^2}}}{{1 - \log {x^2}}}} \right] = {\tan ^{ - 1}}1 + {\tan ^{ - 1}}(\log {x^2})$

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

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