#50

[Amy Allen]

Has anyone been able to do the integrals that result from variation of parameters in 50? I got sin(2x)*sinh(2x)(/2cos^2(2x)-2sin^2(2x)).

On Tue, Mar 16, 2010 at 11:11 PM, Chad S <sch...@illinois.edu> wrote:

Can we plot the characteristic equation using Wolfram Alpha to find
another root, do we have to figure out how to do it in Matlab, or do
we have to solve it by hand? I plan on using wolfram alpha to find the
second root, finding the other two by hand, and then use use Matlab to
solve the system of linear equations. Is this acceptable?

[Chris Moss]

I struggled with this a bit, and the only way I could do it was to
find yc in terms of e^(2x) and e^(-2x) instead of cosh and sinh, and
then convert sinh(2x) into (e^(2x)-e^(-2x))/2.

On Mar 17, 12:06 am, Amy Allen <theinkstainedwre...@gmail.com> wrote:
> Has anyone been able to do the integrals that result from variation of
> parameters in 50? I got sin(2x)*sinh(2x)(/2cos^2(2x)-2sin^2(2x)).
>