# Homework Help: Really Quick Differential Equation question

1. Apr 19, 2008

!!Really Quick Differential Equation question...

1. The problem statement, all variables and given/known data
Alright so this is what I have for this problem. As you can see I used -i to find my Eigenvectors.....now when I find my solution and plug it back into the original, I am getting the opposite of what I am supposed to get.

Was I supposed to use -t instead of +t in my solution since I used lambda=-i to find it?
Or did I make some stupid algebraic error again?

THanks!

2. Apr 19, 2008

I am thinking I should have used cos(-t) and sin(-t) since I used $-i\Rightarrow \alpha=0\ \beta=-1$