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Difficulty solving some second order differential equations

I have trouble finding 10% and 90% of the rise time in a second order differential equation.

I have tried to search but i have not solved my issue, so now i ask here.

I have added the code to aleph.sagemath.org however the link is crazy long so i put it in a short link: http://bit.utoft.org/138hfAz

The code is also on pastebin http://pastebin.com/4hwdLJuT

Please help :)

Cheers J. Utoft

Difficulty solving some second order differential equations

I have trouble finding 10% and 90% of the rise time in a second order differential equation.

I have tried to search but i have not solved my issue, so now i ask here.

I have added the code to aleph.sagemath.org however the link is crazy long so i put it in a short link: http://bit.utoft.org/138hfAz

The code is also on pastebin http://pastebin.com/4hwdLJuT

Please help :)

Cheers J. Utoft