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