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D( t )
t^2 = 0
t^2 = 0
t^2 = 0
1*t^2 = 0 // : 1
t^2 = 0
t = 0
t in (-oo:0) U (0:+oo)
(((2*t^3-(2*t^2))/4)/(t^2))/8 = 0
(((2*t^3-2*t^2)/4)/(t^2))/8 = 0
(2*t^3-2*t^2)/(4*8*t^2) = 0
2*t^3-2*t^2 = 0
2*t^2*(t-1) = 0
t-1 = 0 // + 1
t = 1
2*t^2*(t-1) = 0
(2*t^2*(t-1))/(4*8*t^2) = 0
( 2*t^2 )
2*t^2 = 0 // : 2
t^2 = 0
t = 0
( t-1 )
t-1 = 0 // + 1
t = 1
t in { 0}
t = 1
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