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(Solved) Let z=f(u,v) where u=x^2-y^2, and v=2xy. If z_uu+z_vv=0, show that

Question: Let \(z=f\left( u,v \right)\) where \(u={{x}^{2}}-{{y}^{2}}\), and \(v=2xy\). If \({{z}_{uu}}+{{z}_{vv}}=0\), show that \({{z}_{xx}}+{{z}_{yy}}=0\)

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