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D( t )
t = 0
t = 0
t = 0
t in (-oo:0) U (0:+oo)
6*(1/t-1+1) = 1/6 // - 1/6
6*(1/t-1+1)-(1/6) = 0
6*(1/t-1+1)-1/6 = 0
6*t^-1-1/6 = 0
(6^2*t^-1)/6-1/6 = 0
6^2*t^-1-1 = 0
36*t^-1-1 = 0
(36*t^-1-1)/6 = 0
(36*t^-1-1)/6 = 0 // * 6
36*t^-1-1 = 0
36*t^-1 = 1 // : 36
t^-1 = 1/36
-1 < 0
1/(t^1) = 1/36 // * t^1
1 = 1/36*t^1 // : 1/36
36 = t^1
t = 36
t = 36
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