[理工] [工數]-拉氏積分方程
1.y(t)=1-sinht+ S (1+x)y(t-x)dx (S 為積分 範圍從0~t)
答案y=cosht
我是在將Y因式分解分不出來所以不會 希望能在解題時教我
2. y"+y-4 S y(x)sin(t-x)dx=exp(-2t) y(0)=1 y'(0)=0
1 t 1 -2t 1 1
答案y=---e + -----e +----[3cos(3^0.5)t+------- sin(3^0.5)t]
3 7 7 3^0.5
3.y"+(a+b)y'+aby=f(t) y(0)=c y'(0)=d
-bt d+ac -bt -at 1 -bz -az
答案y=ce + ----[e -e ]+----- S (e -e )f(t-z)dz
a-b a-b
S為積分範圍從0~t
感謝大家!!!
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