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[" A (f) "u=sin^(-1)((x)/(y))+tan^(-1)((...

[" A (f) "u=sin^(-1)((x)/(y))+tan^(-1)((y)/(x))" " "f(x)" for "(1)/(1+x)" (then show that) "],[qquad x(del u)/(del x)+y(del u)/(del y)=0]

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