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T in (-oo:+oo)
T^2 = 1/9 // - 1/9
T^2-(1/9) = 0
T^2-1/9 = 0
1*T^2 = 1/9 // : 1
T^2 = 1/9
T^2 = 1/9 // ^ 1/2
abs(T) = 1/3
T = 1/3 or T = -1/3
T in { 1/3, -1/3 }
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