Determine which of the following function \( f: \mathbf{R} \rightar...

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Determine which of the following function \( f: \mathbf{R} \rightarrow \mathbf{R} \) are onto :
\( f(x)=1 \), if \( x \) is rational \( =-1 \), if \( x \) is irrational.
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