यदि $u = x^2 \tan^{-1}(\frac{y}{x}) - y^2 \tan^{-1}(\frac{x}{y})$ है,तो $\frac{\partial^2 u}{\partial x \partial y} = $

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

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