यदि $\frac{\sin ^{-1} x}{a}=\frac{\cos ^{-1} x}{b}=\frac{\tan ^{-1} y}{c}$ और $0 < x < 1$ है,तो $\cos \left(\frac{\pi c}{a + b}\right)$ का मान ज्ञात कीजिए।

  • A
    $\frac{1-y^{2}}{y \sqrt{y}}$
  • B
    $1-y^{2}$
  • C
    $\frac{1-y^{2}}{1+y^{2}}$
  • D
    $\frac{1-y^{2}}{2 y}$

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यदि $y = \sec^{-1}\left(\frac{1}{2x^2 - 1}\right)$ है,तो $\frac{dy}{dx}$ ज्ञात कीजिए,जहाँ $0 < x < \frac{1}{\sqrt{2}}$.

यदि $\sin ^{-1} \frac{1}{3}+\sin ^{-1} \frac{3}{5}+\sin ^{-1} x=\frac{\pi}{2}$ है,तो $x=$

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

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