मान लीजिए $f(x) = \cos^{-1}\left(\frac{2x}{1+x^2}\right) + \sin^{-1}\left(\frac{1-x^2}{1+x^2}\right)$,तो $f(1) + f(2)$ का मान ज्ञात कीजिए।

  • A
    $-\pi$
  • B
    $0$
  • C
    $\pi$
  • D
    $2\pi$

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यदि $\sec ^{-1}\left(\frac{5}{x}\right)+\sin ^{-1} \left(\frac{4}{5}\right)=\frac{\pi}{2}$,जहाँ $x \neq 0$,तो $x=$ . . . . . . .

सिद्ध कीजिए कि $3 \sin ^{-1} x = \sin ^{-1}(3 x - 4 x^{3})$,जहाँ $x \in [-\frac{1}{2}, \frac{1}{2}]$.

यदि $\sin ^{-1}\left(\frac{x}{13}\right)+\operatorname{cosec}^{-1}\left(\frac{13}{12}\right)=\frac{\pi}{2}$ है,तो $x$ का मान ज्ञात कीजिए।

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

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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