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8. ์ผ์ฐจํจ์ $f(x)$๊ฐ ๋ชจ๋ ์ค์ $x$์ ๋ํ์ฌ \[ x f(x) - f(x) = 3x^4 - 3x \] ๋ฅผ ๋ง์กฑ์ํฌ ๋, $\int_{-2}^{2} f(x) \, dx$์ ๊ฐ์? [3์ ] \begin{itemize} \item[1] 12 \item[2] 16 \item[3] 20 \item[4] 24 \item[5] 28 \end{itemize} |