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D( t )
t = 0
t = 0
t = 0
t in (-oo:0) U (0:+oo)
4 = 2.5/t // - 2.5/t
4-(2.5/t) = 0
4-2.5*t^-1 = 0
-2.5*t^-1 = -4 // : -2.5
t^-1 = 1.6
-1 < 0
1/(t^1) = 1.6 // * t^1
1 = 1.6*t^1 // : 1.6
0.625 = t^1
t = 0.625
t = 0.625
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