Let Use polar coordinates to show that f (x, y) is continuous at all (x, y) if
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Let
Use polar coordinates to show that f (x, y) is continuous at all (x, y) if p > 2 but is discontinuous at (0, 0) if p ≤ 2.
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(xy)p f(x,y)=x4 +34 0 (x, y) = (0, 0) (x, y) = (0, 0)
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