A) \[{{x}^{-1}}\]
B) \[{{x}^{2}}\]
C) \[{{x}^{3}}\]
D) \[{{x}^{4}}\]
Correct Answer: C
Solution :
Since \[f(x)={{x}^{3}}\Rightarrow f'(x)=3{{x}^{2}},\]which is non-negative for all real values of x.
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