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D( u )
u = 0
u = 0
u = 0
u in (-oo:0) U (0:+oo)
2/u+1/6 = (5/6)*u // - (5/6)*u
2/u-((5/6)*u)+1/6 = 0
(-5/6)*u+2/u+1/6 = 0
2*u^-1-5/6*u^1+1/6*u^0 = 0
(1/6*u^1-5/6*u^2+2*u^0)/(u^1) = 0 // * u^2
u^1*(1/6*u^1-5/6*u^2+2*u^0) = 0
u^1
(-5/6)*u^2+(1/6)*u+2 = 0
(-5/6)*u^2+(1/6)*u+2 = 0
DELTA = (1/6)^2-(2*4*(-5/6))
DELTA = 241/36
DELTA > 0
u = ((241/36)^(1/2)-(1/6))/(2*(-5/6)) or u = (-(1/6)-(241/36)^(1/2))/(2*(-5/6))
u = -3/5*((241/36)^(1/2)-1/6) or u = 3/5*((241/36)^(1/2)+1/6)
u in { -3/5*((241/36)^(1/2)-1/6), 3/5*((241/36)^(1/2)+1/6)}
u in { -3/5*((241/36)^(1/2)-1/6), 3/5*((241/36)^(1/2)+1/6) }
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