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Math Help - Problem With Integrating Factors

  1. #1
    Member billa's Avatar
    Joined
    Oct 2008
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    Problem With Integrating Factors

    SOLVED... You can ignore this ;D

    When I solve the following First-Order Linear ODE I get the wrong answer....

    y' + y*tan(x)=sin(2x), y(0)=1

    I use the integrating factor |sec(x)| and get the solution

    y=k*|cos(x)|-2*cos^2 (x)

    While a textbook and wolfram alpha say that there should be no absolute value sign around the cos(x)....

    I think my problem was in determining the integrating factor, can anyone explain what I did wrong? I used the formula [LaTeX ERROR: Convert failed]

    Thanks
    Last edited by billa; February 26th 2010 at 03:20 PM.
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