[理工] [Lplace]
1.y=1- sinht + ∫(1+τ)y(t-τ)dτ ...積0~t
Y=1/s - 1/(s^2 -1)+(1/s)exp(s)Y
Y(1-exp(s)/S)=1/s - 1 /(s^2-1)
答案是y=cosht
是我哪個步驟錯了?
2.y''+ y -4∫y(τ)sin(t-τ)dτ..0~t y(0)=1, y(0)'=0
Y(S^4+2S^2-3)/(S^2+1)=1/(S+2)+S
Y=1/(s+2)*(s^2+1)/(s^4 +2S-3) + S/(s^4+2S-3)
要如何轉回來阿?
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