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9. ν¨μ \[ f(x) = a - \sqrt{3} \tan 2x \] κ° λ«νκ΅¬κ° \(\left[ -\frac{\pi}{6}, b \right]\) μμ μ΅λκ° 7, μ΅μκ° 3μ κ°μ§ λ, \(a \times b\)μ κ°μ? (λ¨, \(a\), \(b\)λ μμμ΄λ€.) [4μ ] \begin{itemize} \item[1] \(\frac{\pi}{2}\) \item[2] \(\frac{5\pi}{12}\) \item[3] \(\frac{\pi}{3}\) \item[4] \(\frac{\pi}{4}\) \item[5] \(\frac{\pi}{6}\) \end{itemize} |