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