5xy sin ³²x + 3y² 0, f(x, y) (a) Prove that lim T if (x,y) + (0,0) if (x,y) = (0,0) f(x,y) does not exist. (x,y) = (0,0) b) Deturmine if f is differentiable at (0,0)? Explain why or why not.

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