A) \[f(x)=x\left| x \right|\]
B) \[g(x)=\cos \left| x \right|\]
C) \[h(x)={{x}^{\frac{1}{3}}}\]
D) \[k(x)=\sin \left| x \right|-\left| x \right|\]
Correct Answer: C
Solution :
It is obvious.
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