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D( t )
t = 0
t = 0
t = 0
t in (-oo:0) U (0:+oo)
90 = 128/t // - 128/t
90-(128/t) = 0
90-128*t^-1 = 0
-128*t^-1 = -90 // : -128
t^-1 = 45/64
-1 < 0
1/(t^1) = 45/64 // * t^1
1 = 45/64*t^1 // : 45/64
64/45 = t^1
t = 64/45
t = 64/45
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