($4.6 Variation of Parameters): Solve the equations (a)–(c)
using method of variation of parameters.
(a) y''-6y+9y=8xe^3x
(b) y''-2y'+2y=e^x (secx)
(c) y''-2y'+y= (e^x)/x
Find the General Solutions to the given differential equations
y(t) =
a) 6y' +y = 7t^2
b) ty' − y =
9t2e−9t, t > 0
c) y' − 8y = 9et
d)
y' + y/t = 6 cos
5t, t
> 0