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D( t )
t = 0
t = 0
t = 0
t in (-oo:0) U (0:+oo)
4/t-1 = (3*t)/(-2)+2*t // - (3*t)/(-2)+2*t
4/t-((3*t)/(-2))-(2*t)-1 = 0
(3/2)*t-2*t+4/t-1 = 0
4*t^-1-1/2*t^1-1*t^0 = 0
(4*t^0-1/2*t^2-1*t^1)/(t^1) = 0 // * t^2
t^1*(4*t^0-1/2*t^2-1*t^1) = 0
t^1
(-1/2)*t^2-t+4 = 0
(-1/2)*t^2-t+4 = 0
DELTA = (-1)^2-(4*4*(-1/2))
DELTA = 9
DELTA > 0
t = (9^(1/2)+1)/(2*(-1/2)) or t = (1-9^(1/2))/(2*(-1/2))
t = -4 or t = 2
t in { -4, 2}
t in { -4, 2 }
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