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D( t )
t = 0
t = 0
t = 0
t in (-oo:0) U (0:+oo)
t/8-(8/t) = 0
t/8-8*t^-1 = 0
1/8*t^1-8*t^-1 = 0
(1/8*t^2-8*t^0)/(t^1) = 0 // * t^2
t^1*(1/8*t^2-8*t^0) = 0
t^1
(1/8)*t^2-8 = 0
(1/8)*t^2-8 = 0
DELTA = 0^2-(-8*4*(1/8))
DELTA = 4
DELTA > 0
t = (4^(1/2)+0)/(2*(1/8)) or t = (0-4^(1/2))/(2*(1/8))
t = 8 or t = -8
t in { -8, 8}
t in { -8, 8 }
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