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Math Help - Reduction to first order

  1. #1
    Member
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    Nov 2009
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    169

    Reduction to first order

    How do I reduce this ODE into a system of 2 variables of first oder?

    y'' + (2y^2+3y'^2-1)y' + y = 0
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  2. #2
    Senior Member
    Joined
    Mar 2010
    Posts
    280
    Please try this

    u=y'

    v=y
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