1. LetUse polar coordinates to show that f(x, y) is continuous at all (z, y) ifp ≤ 2, but discontin- uous at (0,0) if p ≤ 2.
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Use polar coordinates to show that f(x, y) is continuous at all (z, y) ifp ≤ 2, but discontin-
uous at (0,0) if p ≤ 2.