13. Let g: R2 → R be a function given by xy x+y g(x, y) = { 0; if (x, y) = (0,0) (a) Show that g(x, y) is continuous at point (0,0) (b) Prove whether g(x, y) is differentiable at (0,0). = if (x, y) = (0,0)

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