Question: Show that if (x, y) is differentiable at (a, b), then the function of one variable (x, b) is differentiable at x = a. Use

Show that if ƒ(x, y) is differentiable at (a, b), then the function of one variable ƒ(x, b) is differentiable at x = a. Use this to prove that ƒ(x, y) = √x²+ y²is not differentiable at (0, 0).

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