यदि $\cos ^{-1}\left(\frac{y}{b}\right)=2 \log \left(\frac{x}{2}\right)$,जहाँ $x>0$,तो $x^2 \frac{d^2 y}{d x^2}+x \frac{d y}{d x}$ का मान क्या होगा?

  • A
    $4 y$
  • B
    $-4 y$
  • C
    $0$
  • D
    $-8 y$

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यदि $a \neq b, x \neq n \pi, n \in Z$ और $y^2 = a^2 \cos^2 x + b^2 \sin^2 x$ है,तो $\frac{d^2 y}{dx^2} + y =$

यदि फलन $y = \sin^{-1} x$ है,तो $\left(1-x^2\right) \frac{d^2 y}{d x^2}$ का मान क्या होगा?

मान लीजिए $f(x) = \frac{\sin x + \cos x - \sqrt{2}}{\sin x - \cos x}$,$x \in [0, \pi] - \{\frac{\pi}{4}\}$. तो $f(\frac{7\pi}{12}) f''(\frac{7\pi}{12})$ का मान ज्ञात कीजिए।

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यदि $y = (ax + b) \cos x$ है,तो $y_2 + y_1 \sin 2x + y(1 + \sin^2 x) = $

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