Could someone show me where I am going wrong? I need to solve this using varation of parameters.
First I found the solution to the homogeneous equation:
Next, (note that y' is hard to see in math form)**
Next I set this to 0:
This changes to:
Next I plugged into the Origioal DE for respectively.
My result is:
Second equation from before:
Solving these 2 equation for and I get:
Using the formula:
The solution should be:
This is according to wolfram alpha:http://www.wolframalpha.com/input/?i...y%3Dcos%28x%29