यदि $u^2 = (x - a)^2 + (y - b)^2 + (z - c)^2$ है,तो $\sum \frac{\partial^2 u}{\partial x^2} = $

  • A
    $\frac{2}{u}$
  • B
    $\frac{3}{u}$
  • C
    $0$
  • D
    $\frac{1}{u}$

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