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Question: How to let maple solve M.U.C 2nd-ODE equation, containing unknown variable?

Question:How to let maple solve M.U.C 2nd-ODE equation, containing unknown variable?

chenaiier 25 Maple
October 26 2020
1

Sorry I can't make it very easy to understand in the title, this is what I want:

In the forms of Method of Underdetermined Coefficient a*y''+b*y'+c*y=F(x), I want the maple to assume b^2 < 4ac so the homogenous will contain sin and cos. Is there any quick command to do this or I have to develop on my own? 

I want this because I want to set the coefficient unknown and graph them, so if I do what Maple default does, when I plug the coefficients (which b^2<4ac) it returns imaginary numbers and I don't know how do deal with it.

Thank you for everyone helping.
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