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D( t )
t = 0
t = 0
t = 0
t in (-oo:0) U (0:+oo)
2/11 = 4/t-1 // - 4/t-1
2/11-(4/t)+1 = 0
2/11-4*t^-1+1 = 0
-4*t^-1 = -13/11 // : -4
t^-1 = 13/44
-1 < 0
1/(t^1) = 13/44 // * t^1
1 = 13/44*t^1 // : 13/44
44/13 = t^1
t = 44/13
t = 44/13
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