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Math Help - Eulers Method - proving a solution

  1. #1
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    Eulers Method - proving a solution

    First off, I read the sticky, I hope to understand it all one day

    I am supposed to verify the the solution of the differential equation:

    Solution: -cosx ln abs(secx + tan x). The equation is y" +y = tanx

    Now, I have the solution spelled out in my answer guide, but I don't know how they got from step to step (just so you know I'm not looking for an answer handout)
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  2. #2
    MHF Contributor
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    You will need the second derivative of that lovely expression.

    Substitute into the Differential equation.

    After a little algebra, you should be able to demonstrate equality.

    That's all there is to it.
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