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D( y )
y+6 = 0
y+2 = 0
y+6 = 0
y+6 = 0
y+6 = 0 // - 6
y = -6
y+2 = 0
y+2 = 0
y+2 = 0 // - 2
y = -2
y in (-oo:-6) U (-6:-2) U (-2:+oo)
1/(y+2)+1/(y+6) = 1 // - 1
1/(y+2)+1/(y+6)-1 = 0
(1*(y+6))/((y+2)*(y+6))+(1*(y+2))/((y+2)*(y+6))+(-1*(y+2)*(y+6))/((y+2)*(y+6)) = 0
1*(y+6)+1*(y+2)-1*(y+2)*(y+6) = 0
2*y-y^2-8*y-12+8 = 0
-y^2-6*y-4 = 0
-y^2-6*y-4 = 0
-1*(y^2+6*y+4) = 0
y^2+6*y+4 = 0
DELTA = 6^2-(1*4*4)
DELTA = 20
DELTA > 0
y = (20^(1/2)-6)/(1*2) or y = (-20^(1/2)-6)/(1*2)
y = (2*5^(1/2)-6)/2 or y = (-2*5^(1/2)-6)/2
-1*(y-((-2*5^(1/2)-6)/2))*(y-((2*5^(1/2)-6)/2)) = 0
(-1*(y-((-2*5^(1/2)-6)/2))*(y-((2*5^(1/2)-6)/2)))/((y+2)*(y+6)) = 0
(-1*(y-((-2*5^(1/2)-6)/2))*(y-((2*5^(1/2)-6)/2)))/((y+2)*(y+6)) = 0 // * (y+2)*(y+6)
-1*(y-((-2*5^(1/2)-6)/2))*(y-((2*5^(1/2)-6)/2)) = 0
( y-((-2*5^(1/2)-6)/2) )
y-((-2*5^(1/2)-6)/2) = 0 // + (-2*5^(1/2)-6)/2
y = (-2*5^(1/2)-6)/2
( y-((2*5^(1/2)-6)/2) )
y-((2*5^(1/2)-6)/2) = 0 // + (2*5^(1/2)-6)/2
y = (2*5^(1/2)-6)/2
y in { (-2*5^(1/2)-6)/2, (2*5^(1/2)-6)/2 }
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