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2009-05-14T15:00:19+02:00
(a1 + a5)/a3 = (a1 + a1*q^4)/(a1*q^2) = (a1(1 + q^4))/(a1*q^2) = (1 + q^4)/(q^2) = 4.25

(1 + q^4)/(q^2) = 4.25
1 + q^4 = 4.25*q^2
q^4 - 4.25*q^2 + 1 = 0
t = q^2
q1 = -0.05
q2 = 0.05
q3 = -2
q4 = 2
2 2 2