In this video, we will talk about the method that will help us to find solution to a second order homogeneous linear differential equation. In this scenario, one solution will be given to us and we need to find another linearly independent solution to the given ordinary differential equation. We will see the proof for the same and at the end we will derive the formula as well. One can use this formula directly to find second linearly independent solution. This content you can find in 2nd chapter of Erwin Kreyszig, Engineering Mathematics.