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D( t )
t = 0
t = 0
t = 0
t in (-oo:0) U (0:+oo)
-1/t = -6 // + 6
6-1/t = 0
-1*t^-1 = -6 // : -1
t^-1 = 6
-1 < 0
1/(t^1) = 6 // * t^1
1 = 6*t^1 // : 6
1/6 = t^1
t = 1/6
t = 1/6
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