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D( t )
2*t^3 = 0
2*t^3 = 0
2*t^3 = 0
2*t^3 = 0 // : 2
t^3 = 0
t = 0
t in (-oo:0) U (0:+oo)
(12*t^6-(8*t^8))/(2*t^3) = 0
(12*t^6-8*t^8)/(2*t^3) = 0
12*t^6-8*t^8 = 0
4*t^6*(3-2*t^2) = 0
-2*t^2 = -3 // : -2
t^2 = 3/2
t^2 = 3/2 // ^ 1/2
abs(t) = (3/2)^(1/2)
t = (3/2)^(1/2) or t = -(3/2)^(1/2)
4*t^6*(t-(3/2)^(1/2))*(t+(3/2)^(1/2)) = 0
(4*t^6*(t-(3/2)^(1/2))*(t+(3/2)^(1/2)))/(2*t^3) = 0
( 4*t^6 )
4*t^6 = 0 // : 4
t^6 = 0
t = 0
( t+(3/2)^(1/2) )
t+(3/2)^(1/2) = 0 // - (3/2)^(1/2)
t = -(3/2)^(1/2)
( t-(3/2)^(1/2) )
t-(3/2)^(1/2) = 0 // + (3/2)^(1/2)
t = (3/2)^(1/2)
t in { 0}
t in { -(3/2)^(1/2), (3/2)^(1/2) }
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