How to Solve Linear Differential Equations with Trigonometric Functions?

[blondie1234]

1. Find all real solutions: (dx/dt)-2x=cos(3t)

Homework Equations

3. I really don't know where to start here. Any advice to get me on my feet would be appreciated.

 

[Mark44]

1. Find all real solutions: (dx/dt)-2x=cos(3t)



2. Homework Equations



3. I really don't know where to start here. Any advice to get me on my feet would be appreciated.

Try to find an integrating factor.