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4. ํ•จ์ˆ˜ $( y = f(x) )$๊ฐ€ ๋‹ค์Œ๊ณผ ๊ฐ™์ด ์ •์˜๋˜์–ด ์žˆ๋‹ค.

\[
f(x) =
\begin{cases}
-x+2, & x < -1, \\
2, & x = -1, \\
(3*x+3)/2, & -1 < x < 1, \\
1, & 1 \leq x < 2, \\
3, & x = 2, \\
1, & x \geq 2.
\end{cases}
\]

\[ \lim_{x \to -1-} f(x) + \lim_{x \to 2} f(x) \text{์˜ ๊ฐ’์€? [3์ ]} \]

\begin{itemize} \item[1] 1 \item[2] 2 \item[3] 3 \item[4] 4 \item[5] 5 \end{itemize}