Which one of the following is not a one-to-one function?单项选择题

A

A. [math: f:R+→R,f(x)=loge(x)] f:R^+\rightarrow R, f(x)=log_e(x)

B

B. [math: f:R→R,f(x)=sin(x)] f:R \rightarrow R, f(x)=sin(x)

C

C. [math: f:R→R,f(x)=2x] f:R \rightarrow R, f(x)=2^x

D

D. [math: f:R→R,f(x)=x3] f:R \rightarrow R, f(x)=x^3

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Which of the following is NOT a one-to-one function?

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