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12. μ‹€μˆ˜ μ „μ²΄μ˜ μ§‘ν•©μ—μ„œ 연속인 ν•¨μˆ˜ \( f(x) \) κ°€ λ‹€μŒ 쑰건을 λ§Œμ‘±μ‹œν‚¨λ‹€.

\[
n-1 \leq x < n \text{일 λ•Œ}, \ |f(x)| = |6(x-n+1)(x-n)| \text{이닀.} \ (\text{단}, \ n \text{은 μžμ—°μˆ˜μ΄λ‹€.})
\]

열린ꡬ간 \( (0, 4) \)μ—μ„œ μ •μ˜λœ ν•¨μˆ˜

\[
g(x) = \int_0^x f(t) dt - \int_x^4 f(t) dt
\]

κ°€ \( x = 2 \)μ—μ„œ μ΅œμ†Ÿκ°’ 0을 κ°€μ§ˆ λ•Œ, \( \int_{\frac{1}{2}}^{4} f(x) dx \) 의 값은? [4점]

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