I'm trying to solve the following linear second order equation with dsolve in the symbolic workflow.
When I solve it I get a solution in the form of exponents with complex arguments. I would like to receive the answer in therms of sines and cosines only.
Funnily, when I break the right hand side and solve it part by part, I get trigonometric solutions.
Any ideas on how to force dsolve to give trigonometric solutions? Or simplify the exponents by using the Euler identites?