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D( t )
t = 0
t = 0
t = 0
t in (-oo:0) U (0:+oo)
4/t-2 = 14 // - 14
4/t-14-2 = 0
4*t^-1 = 16 // : 4
t^-1 = 4
-1 < 0
1/(t^1) = 4 // * t^1
1 = 4*t^1 // : 4
1/4 = t^1
t = 1/4
t = 1/4
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