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D( y )
y-1 = 0
y^2-1 = 0
y+1 = 0
y-1 = 0
y-1 = 0
y-1 = 0 // + 1
y = 1
y^2-1 = 0
y^2-1 = 0
1*y^2 = 1 // : 1
y^2 = 1
y^2 = 1 // ^ 1/2
abs(y) = 1
y = 1 or y = -1
y+1 = 0
y+1 = 0
y+1 = 0 // - 1
y = -1
y in (-oo:-1) U (-1:1) U (1:+oo)
3/(y+1)+1/(y-1) = 2/(y^2-1) // - 2/(y^2-1)
3/(y+1)+1/(y-1)-(2/(y^2-1)) = 0
3/(y+1)+1/(y-1)-2*(y^2-1)^-1 = 0
3/(y+1)+1/(y-1)-2/(y^2-1) = 0
(3*(y-1)*(y^2-1))/((y+1)*(y-1)*(y^2-1))+(1*(y+1)*(y^2-1))/((y+1)*(y-1)*(y^2-1))+(-2*(y+1)*(y-1))/((y+1)*(y-1)*(y^2-1)) = 0
3*(y-1)*(y^2-1)+1*(y+1)*(y^2-1)-2*(y+1)*(y-1) = 0
4*y^3-2*y^2-2*y^2-4*y+2+2 = 0
4*y^3-4*y^2-4*y+4 = 0
4*y^3-4*y^2-4*y+4 = 0
4*(y^3-y^2-y+1) = 0
y^3-y^2-y+1 = 0
{ 1, -1 }
1
y = 1
y^3-y^2-y+1 = 0
1
y-1
y^2-1
y^3-y^2-y+1
y-1
y^2-y^3
1-y
y-1
0
y^2-1 = 0
DELTA = 0^2-(-1*1*4)
DELTA = 4
DELTA > 0
y = (4^(1/2)+0)/(1*2) or y = (0-4^(1/2))/(1*2)
y = 1 or y = -1
y in { -1, 1, 1}
4*(y+1)*(y-1)^2 = 0
(4*(y+1)*(y-1)^2)/((y+1)*(y-1)*(y^2-1)) = 0
(4*(y+1)*(y-1)^2)/((y+1)*(y-1)*(y^2-1)) = 0 // * (y+1)*(y-1)*(y^2-1)
4*(y+1)*(y-1)^2 = 0
( y+1 )
y+1 = 0 // - 1
y = -1
( y-1 )
y-1 = 0 // + 1
y = 1
y in { -1}
y in { 1}
y belongs to the empty set
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