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5. ν¨μ \( f(x) = (x^2 + 1)(3x^2 - x) \)μ λνμ¬ \( f'(1) \)μ κ°μ? [3μ ] \begin{itemize} \item[1] \( 8 \) \item[2] \( 10 \) \item[3] \( 12 \) \item[4] \( 14 \) \item[5] \( 16 \) \end{itemize}