(2)y"-2y+17y=0,y(0)=1,y(0)=
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题目不全, 按 y'(0) = 0 计算。
y"-2y+17y = 0
特征方程 r^2 - 2r + 17 = 0, r = 1 ± 4i
y = e^x (Acos4x + Bsin4x)
y' = e^x [(A+4B)cos4x + (B-4A)sin4x]
y(0) = 1, A = 1 ;
y'(0) = 0, A+4B = 0, B = -1/4
y = e^x [cos4x - (1/4)sin4x]
y"-2y+17y = 0
特征方程 r^2 - 2r + 17 = 0, r = 1 ± 4i
y = e^x (Acos4x + Bsin4x)
y' = e^x [(A+4B)cos4x + (B-4A)sin4x]
y(0) = 1, A = 1 ;
y'(0) = 0, A+4B = 0, B = -1/4
y = e^x [cos4x - (1/4)sin4x]
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