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27. μ€μ \( t \)μ λνμ¬ μμ μ μ§λκ³ κ³‘μ \( y = \frac{1}{e^x} + e^t \)μ μ νλ μ§μ μ κΈ°μΈκΈ°λ₯Ό \( f(t) \)λΌ νμ. \( f(a) = -e \sqrt{e} \)λ₯Ό λ§μ‘±μν€λ μμ \( a \)μ λνμ¬ \( f'(a) \)μ κ°μ? [3μ ] \begin{itemize} \item[1] $-\frac{1}{3} e \sqrt{e}$ \item[2] $-\frac{1}{2} e \sqrt{e}$ \item[3] $-\frac{2}{3} e \sqrt{e}$ \item[4] $-\frac{5}{6} e \sqrt{e}$ \item[5] $-e \sqrt{e}$ \end{itemize} |