यदि $0 \leqslant \cos ^{-1} x \leqslant \pi$ और $\frac{-\pi}{2} \leqslant \sin ^{-1} x \leqslant \frac{\pi}{2}$ है,तो $x=\frac{1}{5}$ पर $\cos \left(2 \cos ^{-1} x+\sin ^{-1} x\right)$ का मान है

  • A
    $-\sqrt{\frac{24}{25}}$
  • B
    $\sqrt{\frac{24}{25}}$
  • C
    $\frac{\sqrt{24}}{25}$
  • D
    $\frac{-\sqrt{24}}{25}$

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यदि $\cos^{-1}\left(\frac{2}{3x}\right) + \cos^{-1}\left(\frac{3}{4x}\right) = \frac{\pi}{2}$ और $x > \frac{3}{4}$ है,तो $x$ का मान ज्ञात कीजिए।

$(\tan ^{-1} x)^2+(\cot ^{-1} x)^2=\frac{5 \pi^2}{8} \Rightarrow x=$

$\frac{d}{dx}(\sin^{-1}(3x - 4x^3)) = $

यदि $\tan ^{-1} \frac{x-1}{x-2}+\tan ^{-1} \frac{x+1}{x+2}=\frac{\pi}{4}$ है,तो $x$ का मान ज्ञात कीजिए।

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यदि $(\sin ^{-1} x)^{2}-(\cos ^{-1} x)^{2}=a ; 0 < x < 1, a \neq 0$ है,तो $2 x^{2}-1$ का मान क्या है?

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