यदि $x = a \cos \theta$ और $y = a \sin \theta$ है,तो $\frac{d^2 y}{d x^2} =$ . . . . . . . (जहाँ $a \neq 0$ और $\theta \neq k \pi, k \in Z$)

  • A
    $-\frac{1}{a} \operatorname{cosec}^3 \theta$
  • B
    $-\frac{1}{a} \operatorname{cosec}^2 \theta \sec \theta$
  • C
    $\operatorname{cosec}^2 \theta$
  • D
    $\frac{1}{a} \cot^3 \theta$

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$x=\frac{1}{2}$ पर $\sqrt{1-x^2}$ के सापेक्ष $\sec ^{-1}\left(\frac{1}{2 x^2-1}\right)$ का अवकलज क्या है?

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