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D( w )
w = 0
w = 0
w = 0
w in (-oo:0) U (0:+oo)
w/4-(2/w)+5/8 = 7/8-((2*w)/4) // - 7/8-((2*w)/4)
w/4+(2*w)/4-(2/w)+5/8-(7/8) = 0
w/4+(2*w)/4-2*w^-1+5/8-7/8 = 0
3/4*w^1-2*w^-1-1/4*w^0 = 0
(3/4*w^2-1/4*w^1-2*w^0)/(w^1) = 0 // * w^2
w^1*(3/4*w^2-1/4*w^1-2*w^0) = 0
w^1
(3/4)*w^2+(-1/4)*w-2 = 0
(3/4)*w^2+(-1/4)*w-2 = 0
DELTA = (-1/4)^2-(-2*4*(3/4))
DELTA = 97/16
DELTA > 0
w = ((97/16)^(1/2)-(-1/4))/(2*(3/4)) or w = (-(-1/4)-(97/16)^(1/2))/(2*(3/4))
w = 2/3*((97/16)^(1/2)+1/4) or w = 2/3*(1/4-(97/16)^(1/2))
w in { 2/3*(1/4-(97/16)^(1/2)), 2/3*((97/16)^(1/2)+1/4)}
w in { 2/3*(1/4-(97/16)^(1/2)), 2/3*((97/16)^(1/2)+1/4) }
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