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D( t )
t = 0
t = 0
t = 0
t in (-oo:0) U (0:+oo)
8 = 2.3/t // - 2.3/t
8-(2.3/t) = 0
8-2.3*t^-1 = 0
-2.3*t^-1 = -8 // : -2.3
t^-1 = 3.47826087
-1 < 0
1/(t^1) = 3.47826087 // * t^1
1 = 3.47826087*t^1 // : 3.47826087
0.2875 = t^1
t = 0.2875
t = 0.2875
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