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D( t )
3*t^2-12 = 0
3*t^2-12 = 0
3*t^2-12 = 0
3*t^2 = 12 // : 3
t^2 = 4
t^2 = 4 // ^ 1/2
abs(t) = 2
t = 2 or t = -2
t in (-oo:-2) U (-2:2) U (2:+oo)
(2*t)/(3*t^2-12) = 0
2*t = 0 // : 2
t = 0
t = 0
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