यदि $(\cos ^{-1} x)^2-(\sin ^{-1} x)^2 > 0$ है,तो

  • A
    $x < \frac{1}{2}$
  • B
    $-1 < x < \sqrt{2}$
  • C
    $0 \leqslant x < \frac{1}{\sqrt{2}}$
  • D
    $-1 \leqslant x < \frac{1}{\sqrt{2}}$

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यदि $y = \tan^{-1} \left( \frac{4x}{1 + 5x^2} \right) + \tan^{-1} \left( \frac{2 + 3x}{3 - 2x} \right)$ है,तो $\frac{dy}{dx} = $

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

$x=\frac{1}{5}$ पर $\cos \left(2 \cos ^{-1} x+\sin ^{-1} x\right)$ का मान ज्ञात कीजिए,जहाँ $0 \leq \cos ^{-1} x \leq \pi$ और $-\frac{\pi}{2} \leq \sin ^{-1} x \leq \frac{\pi}{2}$ है।

$2{\tan ^{ - 1}}\left( {\frac{1}{3}} \right) + {\tan ^{ - 1}}\left( {\frac{1}{7}} \right) = $

$2 \tan ^{-1}\left(\frac{1}{3}\right)+\cos ^{-1}\left(\frac{3}{5}\right)=$

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