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4. ๋คํญํจ์ $f(x)$์ ๋ํ์ฌ ํจ์ $g(x)$ ๋ฅผ \[ g(x) = x^2 f(x) \] ๋ผ ํ์. $f(2) = 1, \ f'(2) = 3$ ์ผ ๋, $g'(2)$ ์ ๊ฐ์? [3์ ] \begin{itemize} \item[1] 12 \item[2] 14 \item[3] 16 \item[4] 18 \item[5] 20 \end{itemize}