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The ODE solver that I am using solves equations of the form:

The results that I get by solving equation 1 above using my Excel Add-in for ODEs is a sinusoidal type reaction. However, when I solve numerically I get the expected result.

I think my ODE solver may be solving for

I think I may need to transform equation 1 to match the format of equation 2 before solving, but I am not sure. Like I said, it has been several years since taking a DE course so I am little rusty.

Can anyone offer some help?

Thanks!