Justify that a differential equation of the form [y+x f(x^2+y^2)]dx+[y f(x^2+y2)-x]dy=0,whose f(x^2+y^2)is an arbitrary function of (x^2+y^2),is not an exact differential equation and 1/x^2=y^2 is an integrating factor for it. hence solve this differential equation fot f (x^2+y^2)=(x^2=y^2)^2
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