# Question: Let f R2 R be defined by

Let f : R2 →R be defined by

f(x, y) = { x|y| / √x2 + y2 (x, y) ≠ 0, 0 (x, y) =0.

f(x, y) = { x|y| / √x2 + y2 (x, y) ≠ 0, 0 (x, y) =0.

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