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D( y )
y^2-1 = 0
y^2-(3*y)+2 = 0
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^2-(3*y)+2 = 0
y^2-(3*y)+2 = 0
y^2-3*y+2 = 0
y^2-3*y+2 = 0
DELTA = (-3)^2-(1*2*4)
DELTA = 1
DELTA > 0
y = (1^(1/2)+3)/(1*2) or y = (3-1^(1/2))/(1*2)
y = 2 or y = 1
y in (-oo:-1) U (-1:1) U (1:2) U (2:+oo)
3/(y^2-(3*y)+2)+7/(y^2-1) = 0
3/(y^2-3*y+2)+7/(y^2-1) = 0
y^2-3*y+2 = 0
y^2-3*y+2 = 0
y^2-3*y+2 = 0
DELTA = (-3)^2-(1*2*4)
DELTA = 1
DELTA > 0
y = (1^(1/2)+3)/(1*2) or y = (3-1^(1/2))/(1*2)
y = 2 or y = 1
(y-1)*(y-2) = 0
3/((y-1)*(y-2))+7/(y^2-1) = 0
(3*(y^2-1))/((y-1)*(y-2)*(y^2-1))+(7*(y-1)*(y-2))/((y-1)*(y-2)*(y^2-1)) = 0
3*(y^2-1)+7*(y-1)*(y-2) = 0
10*y^2-21*y+11 = 0
10*y^2-21*y+11 = 0
10*y^2-21*y+11 = 0
DELTA = (-21)^2-(4*10*11)
DELTA = 1
DELTA > 0
y = (1^(1/2)+21)/(2*10) or y = (21-1^(1/2))/(2*10)
y = 11/10 or y = 1
(y-1)*(y-11/10) = 0
((y-1)*(y-11/10))/((y-1)*(y-2)*(y^2-1)) = 0
((y-1)*(y-11/10))/((y-1)*(y-2)*(y^2-1)) = 0 // * (y-1)*(y-2)*(y^2-1)
(y-1)*(y-11/10) = 0
( y-1 )
y-1 = 0 // + 1
y = 1
( y-11/10 )
y-11/10 = 0 // + 11/10
y = 11/10
y in { 1}
y = 11/10
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