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If $u=\log\begin{pmatrix}\large\frac{x^{2}+y^{2}}{xy}\end{pmatrix}$ then $x\large\frac{\partial u}{\partial x}+$$y\large\frac{\partial u}{\partial y}$ is

\[\begin{array}{1 1}(1)0&(2)u\\(3)2u&(4)u^{-1}\end{array}\]

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