यदि $\cos ^{-1}\left(\frac{x^2-y^2}{x^2+y^2}\right)=\sin ^{-1}(a)$ है,तो $\frac{d y}{d x}$ का मान ज्ञात कीजिए।

  • A
    $y / x$
  • B
    $-y / x$
  • C
    $x / y$
  • D
    $-x / y$

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यदि $\frac{x}{x-y} = \log \left(\frac{a}{x-y}\right)$ है,तो $\frac{dy}{dx} =$

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