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Homework Help: Derive 6

  1. May 18, 2008 #1
    i'm not sure if this is the right place but i'm trying to get my head around derive 6 and i have a couple of questions that dont seem to be coming out right...

    d[tex]^{2}[/tex]y/dx[tex]^{2}[/tex] + 8dy/dx + 16y = (4e[tex]^{-4x}[/tex])(sinx+cosx)[tex]^{2}[/tex] ; y(0)=y'(0)=0

    so i inputed DSOLVE2_BV(8, 16, (4·^(- 4·x))·(SIN(x) + COS(x)) ∧ 2, x, 0, 0)

    but its not throwing up the right answer?
  2. jcsd
  3. May 18, 2008 #2


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    Homework Helper

    Are you doing this by hand or computer? If you're solving it by hand, note that the variation of parameters works here; only problem is that the integrals you have to solve for the particular solutions can be rather difficult, though doable.
  4. May 19, 2008 #3
    trying by computer, using a program called derive
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