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17. λ€νν¨μ \( f(x) \)μ λνμ¬ \( f'(x) = 9x^2 + 4x \)μ΄κ³ \( f(1) = 6 \)μΌ λ, \( f(2) \)μ κ°μ ꡬνμμ€. [3μ ]