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4. Let f be a function defined by xy r2 + y6 if (x, y) # (0,0) f (x, y) = %3D 0, if

4. Let f be a function defined by xy r2 + y6 if (x, y) # (0,0) f (x, y) = %3D 0, if (r, y) = (0,0). %3D Is f continuous at (0,0) ? Explain. (10 pt)

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