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[" 0.If "z(x+y)=x^(2)+y^(2)," show that ...

[" 0.If "z(x+y)=x^(2)+y^(2)," show that "],[qquad ((del z)/(del x)-(del z)/(del y))^(2)=4(1-(del z)/(del x)-(del z)/(del y))]

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