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D( t )
t = 0
t = 0
t = 0
t in (-oo:0) U (0:+oo)
10/20 = 45/t // - 45/t
10/20-(45/t) = 0
10/20-45*t^-1 = 0
-45*t^-1 = -1/2 // : -45
t^-1 = 1/90
-1 < 0
1/(t^1) = 1/90 // * t^1
1 = 1/90*t^1 // : 1/90
90 = t^1
t = 90
t = 90
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