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25. μμ μ€μ μ 체μ μ§ν©μμ μ μλκ³ λ―ΈλΆκ°λ₯ν λ ν¨μ \( f(x), g(x) \)κ° μλ€. \( g(x) \)λ \( f(x) \)μ μν¨μμ΄κ³ , \( g'(x) \)λ μμ μ€μ μ 체μ μ§ν©μμ μ°μμ΄λ€. λͺ¨λ μμ \( a \)μ λνμ¬ \[ \int_{1}^{a} \frac{1}{g'(f(x)) f(x)} \, dx = 2 \ln a + \ln (a+1) - \ln 2 \] μ΄κ³ \( f(1) = 8 \)μΌ λ, \( f(2) \)μ κ°μ? [3μ ] \begin{itemize} \item[1] 36 \item[2] 40 \item[3] 44 \item[4] 48 \item[5] 52 \end{itemize} |