Which of the following functions f: R → R is continuous at the point 0 € R? f(x) = x² f(x) = = X {² f(x) = { √x 0 f(x) = = x x + 2 -1 f(x) = = {i² 1 if x ≤ 0 if x > 0 if x ≥ 0 if x < 0 if x ≤ 0 if x > 0 if x < 0 if x > 0 Choose... Choose... Choose... Choose... Choose... <> O <>

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