21. f(s) = A. VZsinv8t B.sinvet D. 2 sinyBt 2s+6 (s+3)=+ 25 A 2e-3t cos5t 22. f(s) =; B.e- cos5t Ccos3t D. 2e cos5i 23. f(s) = 3s+6 B. et D.e 24. f(s) = %3D s-4s+8 A e라stn2t B.e"sin2t C. 2e" sin4t D.e sin4t

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