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D( y )
y = 0
y = 0
y = 0
y in (-oo:0) U (0:+oo)
(2/3)*y = 16/y+2 // - 16/y+2
(2/3)*y-(16/y)-2 = 0
(2/3)*y-16*y^-1-2 = 0
2/3*y^1-16*y^-1-2*y^0 = 0
(2/3*y^2-2*y^1-16*y^0)/(y^1) = 0 // * y^2
y^1*(2/3*y^2-2*y^1-16*y^0) = 0
y^1
(2/3)*y^2-2*y-16 = 0
(2/3)*y^2-2*y-16 = 0
DELTA = (-2)^2-(-16*4*(2/3))
DELTA = 140/3
DELTA > 0
y = ((140/3)^(1/2)+2)/(2*(2/3)) or y = (2-(140/3)^(1/2))/(2*(2/3))
y = 3/4*((140/3)^(1/2)+2) or y = 3/4*(2-(140/3)^(1/2))
y in { 3/4*(2-(140/3)^(1/2)), 3/4*((140/3)^(1/2)+2)}
y in { 3/4*(2-(140/3)^(1/2)), 3/4*((140/3)^(1/2)+2) }
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