यदि $e^{-y} \cdot y = x$ है,तो $\frac{dy}{dx}$ क्या है?

  • A
    $\frac{y}{1-y}$
  • B
    $\frac{1}{xy(1-y)}$
  • C
    $\frac{1}{x(1-y)}$
  • D
    $\frac{y}{x(1-y)}$

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यदि $\cos y = x \cos (a+y)$ और $\cos a \neq \pm 1$ है,तो सिद्ध कीजिए कि $\frac{dy}{dx} = \frac{\cos^2 (a+y)}{\sin a}$ है।

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यदि $y^{2}+\log _{e}\left(\cos ^{2} x\right)=y, x \in\left(-\frac{\pi}{2}, \frac{\pi}{2}\right),$ है,तो

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