[MP PET 1996]
A) $ {x^{-1}} $
B) $ x^{2} $
C) $ x^{3} $
D) $ x^{4} $
Correct Answer: C
Since $ f(x)=x^{3}\Rightarrow f’(x)=3x^{2}, $ which is non-negative for all real values of x.
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