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**Quiz 4 / Q4 problem 2**

« **on:**November 12, 2014, 09:03:38 PM »

Q2: 7.6 #6

r

r

pure imaginary eigenvalue, so it's stable center

also whole soln is in the q1 fisrt post.

r

^{2}+9=0r

_{1}=3i, r2=-3ipure imaginary eigenvalue, so it's stable center

also whole soln is in the q1 fisrt post.