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t in (-oo:+oo)
((4*t^2-5)^1)/2 = 0
(4*t^2-5)/2 = 0
4*t^2 = 5 // : 4
t^2 = 5/4
t^2 = 5/4 // ^ 1/2
abs(t) = (5/4)^(1/2)
t = (5/4)^(1/2) or t = -(5/4)^(1/2)
t in { (5/4)^(1/2), -(5/4)^(1/2) }
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