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9. ν¨μ $f(x) = 3x^2 - 16x - 20$μ λνμ¬ \[ \int_{-2}^a f(x) \, dx = \int_{-2}^0 f(x) \, dx \] μΌ λ, μμ $a$μ κ°μ? [4μ ] \begin{itemize} \item[1] 16 \item[2] 14 \item[3] 12 \item[4] 10 \item[5] 8 \end{itemize}