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D( t )
3*t^2-16 = 0
3*t^2-16 = 0
3*t^2-16 = 0
3*t^2 = 16 // : 3
t^2 = 16/3
t^2 = 16/3 // ^ 1/2
abs(t) = (16/3)^(1/2)
t = (16/3)^(1/2) or t = -(16/3)^(1/2)
t in (-oo:-(16/3)^(1/2)) U (-(16/3)^(1/2):(16/3)^(1/2)) U ((16/3)^(1/2):+oo)
(3-t)/(3*t^2-16) = 0
3-t = 0 // - 3
-t = -3 // * -1
t = 3
t = 3
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