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D( t )
t^2 = 0
t = 0
t^2 = 0
t^2 = 0
1*t^2 = 0 // : 1
t^2 = 0
t = 0
t = 0
t = 0
t in (-oo:0) U (0:+oo)
(1*4*(4/(t^2)))/4 = 1/t-2 // - 1/t-2
(1*4*(4/(t^2)))/4-(1/t)+2 = 0
(4*(4/(t^2)))/4-t^-1+2 = 0
4*t^-2-t^-1+2 = 0
t_1 = t^-1
4*t_1^2-1*t_1^1+2 = 0
4*t_1^2-t_1+2 = 0
DELTA = (-1)^2-(2*4*4)
DELTA = -31
DELTA < 0
t belongs to the empty set
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