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8. ์‚ผ์ฐจํ•จ์ˆ˜ $f(x)$๊ฐ€ ๋ชจ๋“  ์‹ค์ˆ˜ $x$์— ๋Œ€ํ•˜์—ฌ

\[ x f(x) - f(x) = 3x^4 - 3x \]

๋ฅผ ๋งŒ์กฑ์‹œํ‚ฌ ๋•Œ, $\int_{-2}^{2} f(x) \, dx$์˜ ๊ฐ’์€? [3์ ]

\begin{itemize}
    \item[1] 12
    \item[2] 16
    \item[3] 20
    \item[4] 24
    \item[5] 28
\end{itemize}