y = y1 + y0
y1 = a*sin2x + b*cos2x
y1'' + 2'y1 + 5y1 = (-4a - 4b + 5a)sin2x + (-4b + 4a + 5b)cos2b = -17sin2x
a - 4b = -17, b + 4a = 0
17a = -17 -> a = -1, b = 4
y1 = 4cos2x - sin2x
y0'' + 2y0' + 5y0 = 0
k² + 2k + 5 = 0 -> k = -1 +- √(1-5) = -1 +- 2i
y0 = e^(-x)*(C*sin2x + D*cos2x)
y = 4cos2x - sin2x + e^(-x)*(C*sin2x + D*cos2x)
Решение читайте ниже.
y = y1 + y0
y1 = a*sin2x + b*cos2x
y1'' + 2'y1 + 5y1 = (-4a - 4b + 5a)sin2x + (-4b + 4a + 5b)cos2b = -17sin2x
a - 4b = -17, b + 4a = 0
17a = -17 -> a = -1, b = 4
y1 = 4cos2x - sin2x
y0'' + 2y0' + 5y0 = 0
k² + 2k + 5 = 0 -> k = -1 +- √(1-5) = -1 +- 2i
y0 = e^(-x)*(C*sin2x + D*cos2x)
y = 4cos2x - sin2x + e^(-x)*(C*sin2x + D*cos2x)
Решение читайте ниже.