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D( w )
w = 0
w = 0
w = 0
w in (-oo:0) U (0:+oo)
(16*w)/25 = 10/w // - 10/w
(16*w)/25-(10/w) = 0
(16*w)/25-10*w^-1 = 0
16/25*w^1-10*w^-1 = 0
(16/25*w^2-10*w^0)/(w^1) = 0 // * w^2
w^1*(16/25*w^2-10*w^0) = 0
w^1
(16/25)*w^2-10 = 0
(16/25)*w^2-10 = 0
DELTA = 0^2-(-10*4*(16/25))
DELTA = 128/5
DELTA > 0
w = ((128/5)^(1/2)+0)/(2*(16/25)) or w = (0-(128/5)^(1/2))/(2*(16/25))
w = 25/32*(128/5)^(1/2) or w = 25/32*(128/5)^(1/2)
w in { 25/32*(128/5)^(1/2), 25/32*(128/5)^(1/2)}
w in { 25/32*(128/5)^(1/2), 25/32*(128/5)^(1/2) }
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