Question

if c1,c2,c3,c4,c5 are constants then what is the order of differential equation given by y=c1(cos(x+c2)) +c2(sin(x+c3)) + c4e^x + c5

Answer 1

The term "c1(cos(x+c2)) +c2(sin(x+c3))" can be written as "A cos(x+B)"
where A and B are arbitrary constants.

I think the rest is obvious. :)