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D( t )
((1/2)*t^-1)/2 = 0
t = 0
((1/2)*t^-1)/2 = 0
((1/2)*t^-1)/2 = 0
1/4*t^-1 = 0 // : 1/4
t^-1 = 0
t należy do O
t = 0
t = 0
t in (-oo:0) U (0:+oo)
3/(((1/2)*t^-1)/2) = 0
12*t = 0 // : 12
t = 0
t in { 0}
t belongs to the empty set
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