f(x) = x3 \[-\] 1 on R .
We can observe that f(x) increases when the values of x increase and f(x) decreases when the values of x decrease.
Also, f(x) can be reduced by giving smaller values of x.
Similarly, f(x) can be enlarged by giving larger values of x.
So, f(x) does not have a minimum or maximum value.
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