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If $u=log (e^x+e^y),$ then $\frac{\partial u}{\partial x}+\frac{\partial u}{\partial y}=$

  1. $e^x+e^y$
  2. $e^x-e^y$
  3. $\frac{1}{e^x+e^y}$
  4. $1$
in Linear Algebra 7.9k points
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