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D( t )
2*t = 0
2*t = 0
2*t = 0
2*t = 0 // : 2
t = 0
t in (-oo:0) U (0:+oo)
8/(2*t) = 10 // - 10
8/(2*t)-10 = 0
4*t^-1 = 10 // : 4
t^-1 = 5/2
-1 < 0
1/(t^1) = 5/2 // * t^1
1 = 5/2*t^1 // : 5/2
2/5 = t^1
t = 2/5
t = 2/5
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