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