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D( t )
t = 0
t = 0
t = 0
t in (-oo:0) U (0:+oo)
3.14 = 6.28/t // - 6.28/t
3.14-(6.28/t) = 0
3.14-6.28*t^-1 = 0
-6.28*t^-1 = -3.14 // : -6.28
t^-1 = 0.5
-1 < 0
1/(t^1) = 0.5 // * t^1
1 = 0.5*t^1 // : 0.5
2 = t^1
t = 2
t = 2
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