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determine whether the function f is differentiable at (0, 0) xy if a2 + 2 + 0 f (x, y ) 0. if x =

determine whether the function f is differentiable at (0, 0)

xy if a2 + 2 + 0 f (x, y ) 0. if x = y = 0. 1 f ( 2 )

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