(2)当见=0时 X=Ax+B A=B=0 (3)当 > >0时 A(x)=Acos√x+Bsin√x A=0,Bsin√L=00.8 1 0.6 0.4 0.2 0 x t 0 0.5 1 1.5 2 −1 −0.5 0 0.5 1 n 10 (2). 当  = 0 时 X = Ax + B A = B = 0 (3).当   0 时 X (x) = Acos  x + Bsin  x A = 0, Bsin L = 0