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D( t )
4*t-8 = 0
4*t-8 = 0
4*t-8 = 0
4*t-8 = 0 // + 8
4*t = 8 // : 4
t = 8/4
t = 2
t in (-oo:2) U (2:+oo)
41/(4*t-8) = t+8/8 // - t+8/8
41/(4*t-8)-t-(8/8) = 0
41/(4*t-8)-t-1 = 0
41/(4*t-8)+(-t*(4*t-8))/(4*t-8)+(-1*(4*t-8))/(4*t-8) = 0
41-t*(4*t-8)-1*(4*t-8) = 0
8*t-4*t^2-4*t+8+41 = 0
4*t-4*t^2+49 = 0
4*t-4*t^2+49 = 0
4*t-4*t^2+49 = 0
DELTA = 4^2-(-4*4*49)
DELTA = 800
DELTA > 0
t = (800^(1/2)-4)/(-4*2) or t = (-800^(1/2)-4)/(-4*2)
t = (20*2^(1/2)-4)/(-8) or t = (-20*2^(1/2)-4)/(-8)
(t-((20*2^(1/2)-4)/(-8)))*(t-((-20*2^(1/2)-4)/(-8))) = 0
((t-((20*2^(1/2)-4)/(-8)))*(t-((-20*2^(1/2)-4)/(-8))))/(4*t-8) = 0
((t-((20*2^(1/2)-4)/(-8)))*(t-((-20*2^(1/2)-4)/(-8))))/(4*t-8) = 0 // * 4*t-8
(t-((20*2^(1/2)-4)/(-8)))*(t-((-20*2^(1/2)-4)/(-8))) = 0
( t-((-20*2^(1/2)-4)/(-8)) )
t-((-20*2^(1/2)-4)/(-8)) = 0 // + (-20*2^(1/2)-4)/(-8)
t = (-20*2^(1/2)-4)/(-8)
( t-((20*2^(1/2)-4)/(-8)) )
t-((20*2^(1/2)-4)/(-8)) = 0 // + (20*2^(1/2)-4)/(-8)
t = (20*2^(1/2)-4)/(-8)
t in { (-20*2^(1/2)-4)/(-8), (20*2^(1/2)-4)/(-8) }
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