Thanks, i understand. I wrote it like this now: 

I have a new question now tough. In the end, i write simplify Lar, and it gives a equation. I want maple to re-write this equation, to either θ1 =...... or θ2=....... How can i achieve this? I think this is required so i van plot it! 

Thanks,

Jonas

maplesheet.mw

Download maplesheet.mw

OOPS! Nevermind! got it!

You are my hero! thanks so much! 

You are my hero! thanks so much!