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D( t )
t = 0
t = 0
t = 0
t in (-oo:0) U (0:+oo)
9.2/t = 46 // - 46
9.2/t-46 = 0
9.2*t^-1 = 46 // : 9.2
t^-1 = 5
-1 < 0
1/(t^1) = 5 // * t^1
1 = 5*t^1 // : 5
1/5 = t^1
t = 1/5
t = 1/5
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