Let f be defined by f(x,y)=(x^2 y^2)/((x^2+y^2 ) ) when (x,y)≠(0,0) and f(0,0) = 0 show that .....

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Let f(x.y)=1/4 (x^2+y^2 ) log(x^2+y^2 ) ,when (x,y)≠(0,0) and f(0,0) = 0 show that fxy and fyx ...
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