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QUESTION
Prove that x3 = O(x4 ) but x4 is not O(x3 ). Prove that f (x) = (g(x)) if and only if f (x) = O(g(x)) and g(x) = O(f (x)).
Prove that x3 = O(x4 ) but x4 is not O(x3 ). Prove that f (x) = (g(x)) if and only if f (x) = O(g(x)) and g(x) = O(f (x)).
