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T in (-oo:+oo)
(1/2)*T^2-36 = 0
1/2*T^2 = 36 // : 1/2
T^2 = 72
T^2 = 72 // ^ 1/2
abs(T) = 6*2^(1/2)
T = 6*2^(1/2) or T = -(6*2^(1/2))
T in { 6*2^(1/2), -(6*2^(1/2)) }
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