Find the first Four nonzero terms in power series expansion about x=0
or
For an initial value system
Hello,
Consider the power series expansion of the solution (in any equation)
Then
etc...
Then find a recursive relation between and (or possibly , for the last equation)
See here for an example : http://www.mathhelpforum.com/math-he...s-problem.html (take care of the steps, that's all)