tf2.tex
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	\begin{question}{TF-02}
	Let $f\colon \mathbb{R}\rightarrow \mathbb{R}$ and
	$g\colon\mathbb{R}\rightarrow \mathbb{R}$ are two functions defined on all
	$\mathbb{R}$. If
	% $f$ and
	$f\circ g$ is injective, then $g$ is injective.
	\TRUE
	\end{question}