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D( u )
u = 0
u = 0
u = 0
u in (-oo:0) U (0:+oo)
1/u+2 = (-3/4)*u+2+8 // - (-3/4)*u+2+8
1/u-((-3/4)*u)-8-2+2 = 0
(3/4)*u+1/u-8-2+2 = 0
3/4*u^1+1*u^-1-8*u^0 = 0
(3/4*u^2-8*u^1+1*u^0)/(u^1) = 0 // * u^2
u^1*(3/4*u^2-8*u^1+1*u^0) = 0
u^1
(3/4)*u^2-8*u+1 = 0
(3/4)*u^2-8*u+1 = 0
DELTA = (-8)^2-(1*4*(3/4))
DELTA = 61
DELTA > 0
u = (61^(1/2)+8)/(2*(3/4)) or u = (8-61^(1/2))/(2*(3/4))
u = 2/3*(61^(1/2)+8) or u = 2/3*(8-61^(1/2))
u in { 2/3*(8-61^(1/2)), 2/3*(61^(1/2)+8)}
u in { 2/3*(8-61^(1/2)), 2/3*(61^(1/2)+8) }
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