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D( t )
t = 0
t = 0
t = 0
t in (-oo:0) U (0:+oo)
4/t = 1/5 // - 1/5
4/t-(1/5) = 0
4/t-1/5 = 0
4*t^-1 = 1/5 // : 4
t^-1 = 1/20
-1 < 0
1/(t^1) = 1/20 // * t^1
1 = 1/20*t^1 // : 1/20
20 = t^1
t = 20
t = 20
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