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D( t )
t = 0
t = 0
t = 0
t in (-oo:0) U (0:+oo)
6/t-(7/t)-4 = 4/t-(4*t)-2 // - 4/t-(4*t)-2
4*t+6/t-(7/t)-(4/t)-4+2 = 0
4*t+6/t-7*t^-1-4*t^-1-4+2 = 0
4*t^1-5*t^-1-2*t^0 = 0
(4*t^2-2*t^1-5*t^0)/(t^1) = 0 // * t^2
t^1*(4*t^2-2*t^1-5*t^0) = 0
t^1
4*t^2-2*t-5 = 0
4*t^2-2*t-5 = 0
DELTA = (-2)^2-(-5*4*4)
DELTA = 84
DELTA > 0
t = (84^(1/2)+2)/(2*4) or t = (2-84^(1/2))/(2*4)
t = (2*21^(1/2)+2)/8 or t = (2-2*21^(1/2))/8
t in { (2-2*21^(1/2))/8, (2*21^(1/2)+2)/8}
t in { (2-2*21^(1/2))/8, (2*21^(1/2)+2)/8 }
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