यदि $y = x \operatorname{Tan}^{-1}\left(\frac{x}{y}\right)$ है,तो $\frac{dy}{dx} = $

  • A
    $\frac{y^2}{x^2+y^2}$
  • B
    $\frac{xy}{x^2+y^2}$
  • C
    $\frac{y}{x}$
  • D
    $\frac{y^2}{x^2}$

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