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