`f(x,y) = x-y/x^2 +y^2``f(x,y) = x^1/3, y^-2/3 tan ^-1 x/y``f(x,y) = x (LN SQRT(x^2+y^2) -LNY) +ye^x/y``f(x,y) =x[ln 2x^2+y^2/x -ln(x+y)] +y^2 (tan(x+2y))/(3x-y)`
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