Question: Prove that is continuous on R2 and has first-order partial derivatives everywhere on R2, but f is not differentiable at (0, 0). (x, y)(0.0) (x,

Prove that
Prove that is continuous on R2 and has first-order partial derivatives

is continuous on R2 and has first-order partial derivatives everywhere on R2, but f is not differentiable at (0, 0).

(x, y)(0.0) (x, y) = (0,0) f(x, y) = X2 +y2 0

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