यदि $\frac{y}{x} \cos^4 \alpha + \frac{x}{y} \sin^4 \alpha = 2 \sin^2 \alpha \cos^2 \alpha$ है,तो $\frac{dy}{dx} = $

  • A
    $\sin^3 \alpha \cos \alpha$
  • B
    $\sin^2 \alpha \cos^2 \alpha$
  • C
    $\frac{\sin^2 \alpha}{\cos^2 \alpha}$
  • D
    $\sin \alpha \cos^3 \alpha$

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