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D( t )
t = 0
t = 0
t = 0
t in (-oo:0) U (0:+oo)
100/t = 10.5 // - 10.5
100/t-10.5 = 0
100*t^-1 = 10.5 // : 100
t^-1 = 0.105
-1 < 0
1/(t^1) = 0.105 // * t^1
1 = 0.105*t^1 // : 0.105
9.52380952 = t^1
t = 9.52380952
t = 9.52380952
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