Q.
The order of the differential equation whose general solution is given by y=(C1+C2)cos(x+C3)−C4ex+C5
where C1, C2, C3, C4, C5 are arbitrary constant, is
The given equation can be written as y=Acos(x+C3)−Bex
where A=C1+C2 and B=C4eC5
Here, there are three independent variables, (A,B,C3).
Hence, the differential equation will be of order 3.