यदि $u = \frac{x + y}{x - y}$ है,तो $\frac{\partial u}{\partial x} + \frac{\partial u}{\partial y} = $

  • A
    $\frac{1}{x - y}$
  • B
    $\frac{2}{x - y}$
  • C
    $\frac{1}{(x - y)^2}$
  • D
    $\frac{2}{(x - y)^2}$

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यदि $u = e^{-x^2 - y^2}$ है,तो

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