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2. ํจ์ \( f(x) = x^3 + 3x^2 + x - 1 \) ์ ๋ํ์ฌ \( f'(1) \)์ ๊ฐ์? [2์ ] \begin{itemize} \item[1] 6 \item[2] 7 \item[3] 8 \item[4] 9 \item[5] 10 \end{itemize}