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D( y )
y = 0
y = 0
y = 0
y in (-oo:0) U (0:+oo)
2/y = y/6 // - y/6
2/y-(y/6) = 0
2*y^-1-1/6*y^1 = 0
(2*y^0-1/6*y^2)/(y^1) = 0 // * y^2
y^1*(2*y^0-1/6*y^2) = 0
y^1
(-1/6)*y^2+2 = 0
(-1/6)*y^2+2 = 0
DELTA = 0^2-(2*4*(-1/6))
DELTA = 4/3
DELTA > 0
y = ((4/3)^(1/2)+0)/(2*(-1/6)) or y = (0-(4/3)^(1/2))/(2*(-1/6))
y = -3*(4/3)^(1/2) or y = 3*(4/3)^(1/2)
y in { -3*(4/3)^(1/2), 3*(4/3)^(1/2)}
y in { -3*(4/3)^(1/2), 3*(4/3)^(1/2) }
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