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D( w )
w = 0
w = 0
w = 0
w in (-oo:0) U (0:+oo)
(5/6)*w+1/w = -4 // + 4
(5/6)*w+1/w+4 = 0
5/6*w^1+1*w^-1+4*w^0 = 0
(5/6*w^2+4*w^1+1*w^0)/(w^1) = 0 // * w^2
w^1*(5/6*w^2+4*w^1+1*w^0) = 0
w^1
(5/6)*w^2+4*w+1 = 0
(5/6)*w^2+4*w+1 = 0
DELTA = 4^2-(1*4*(5/6))
DELTA = 38/3
DELTA > 0
w = ((38/3)^(1/2)-4)/(2*(5/6)) or w = (-(38/3)^(1/2)-4)/(2*(5/6))
w = 3/5*((38/3)^(1/2)-4) or w = -3/5*((38/3)^(1/2)+4)
w in { -3/5*((38/3)^(1/2)+4), 3/5*((38/3)^(1/2)-4)}
w in { -3/5*((38/3)^(1/2)+4), 3/5*((38/3)^(1/2)-4) }
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