Identify which of the following functions is one-to-one, onto, and/or one-to-one correspondence. Assume that the following functions (#1 & #2) are the functions defined on the set of real numbers. 3. f1:R→R, where f1 = {(x,y) | y = x³ -x} 4. f2:R-R, defined by f2 = {(x,y) | y = x³}

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