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D( t )
t = 0
t = 0
t = 0
t in (-oo:0) U (0:+oo)
16/80 = 2/t // - 2/t
16/80-(2/t) = 0
16/80-2*t^-1 = 0
-2*t^-1 = -1/5 // : -2
t^-1 = 1/10
-1 < 0
1/(t^1) = 1/10 // * t^1
1 = 1/10*t^1 // : 1/10
10 = t^1
t = 10
t = 10
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