모두CBT
f(t)=L−1[s2+3s+2s2+2s+5]f(t)=\mathcal{L}^{-1}\left[\dfrac{s^2+3s+2}{s^2+2s+5}\right]f(t)=L−1[s2+2s+5s2+3s+2] 는?
δ(t)+e-t(cos2t-sin2t)
δ(t)+e-t(cos2t+2sin2t)
δ(t)+e-t(cos2t-2sin2t)
δ(t)+e-t(cos2t+sin2t)