જો $y = \sec^{-1}\left(\frac{1}{2x^2 - 1}\right)$ હોય,તો $\frac{dy}{dx}$ શોધો,જ્યાં $0 < x < \frac{1}{\sqrt{2}}$.

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

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જો $\cos ^{-1} 2x + \cos ^{-1} 3x = \frac{\pi}{3}$ અને $4x^2 = \frac{a}{b}$ હોય,તો $a + b =$

$\sin^{-1} x - \sin^{-1} 2x = \pm \frac{\pi}{3}$ નો ઉકેલ શોધો.

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