常微分方程,请问这个是怎么求出来的
展开全部
dp/dx - p = sinx
The aux. equation
q-1 =0
q=1
let
p*= Ae^x
let
p1 = Bsinx+Ccosx
p1' = Bcosx -Csinx
p1' - p1 = sinx
Bcosx -Csinx -( Bsinx+Ccosx) =sinx
(B-C)cosx +(-B-C)sinx = sinx
B-C =0
-B-C =1
B=C=-1/2
p = p* +p1 = Ae^x - (1/2)cosx -(1/2)sinx
The aux. equation
q-1 =0
q=1
let
p*= Ae^x
let
p1 = Bsinx+Ccosx
p1' = Bcosx -Csinx
p1' - p1 = sinx
Bcosx -Csinx -( Bsinx+Ccosx) =sinx
(B-C)cosx +(-B-C)sinx = sinx
B-C =0
-B-C =1
B=C=-1/2
p = p* +p1 = Ae^x - (1/2)cosx -(1/2)sinx
推荐律师服务:
若未解决您的问题,请您详细描述您的问题,通过百度律临进行免费专业咨询