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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)
((-1/(t^2))^1)/2 = 0
(-1/(t^2))/2 = 0
-1/2*t^-2 = 0 // : -1/2
t^-2 = 0
t naleu017Cy do O
t belongs to the empty set
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