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Homework Help: Inhomogeneous equations: Variation of Parameters

  1. Aug 16, 2011 #1
    1. The problem statement, all variables and given/known data

    Find a particular solution for these second order differential equations.

    2. Relevant equations

    1) y''+9y=tan3t

    2) y''+y=tan^2t

    3. The attempt at a solution

    I want to find a fundamental solutions y1 and y2 cuz I want to find a particular solution like this y=v1*y1+v2*y2, but i don't know how to get them.
  2. jcsd
  3. Aug 16, 2011 #2


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