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D( y )
y = 0
y = 0
y = 0
y in (-oo:0) U (0:+oo)
(2*y)/9 = 8/y // - 8/y
(2*y)/9-(8/y) = 0
(2*y)/9-8*y^-1 = 0
2/9*y^1-8*y^-1 = 0
(2/9*y^2-8*y^0)/(y^1) = 0 // * y^2
y^1*(2/9*y^2-8*y^0) = 0
y^1
(2/9)*y^2-8 = 0
(2/9)*y^2-8 = 0
DELTA = 0^2-(-8*4*(2/9))
DELTA = 64/9
DELTA > 0
y = ((64/9)^(1/2)+0)/(2*(2/9)) or y = (0-(64/9)^(1/2))/(2*(2/9))
y = 6 or y = -6
y in { -6, 6}
y in { -6, 6 }
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