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D( x )
x^2-1 = 0
x+1 = 0
x-1 = 0
x^2-1 = 0
x^2-1 = 0
1*x^2 = 1 // : 1
x^2 = 1
x^2 = 1 // ^ 1/2
abs(x) = 1
x = 1 or x = -1
x+1 = 0
x+1 = 0
x+1 = 0 // - 1
x = -1
x-1 = 0
x-1 = 0
x-1 = 0 // + 1
x = 1
x in (-oo:-1) U (-1:1) U (1:+oo)
-1/(x+1)-(2/(x-1)) = 3/(x^2-1) // - 3/(x^2-1)
-1/(x+1)-(2/(x-1))-(3/(x^2-1)) = 0
-1/(x+1)-2*(x-1)^-1-3*(x^2-1)^-1 = 0
-1/(x+1)-2/(x-1)-3/(x^2-1) = 0
(-1*(x-1)*(x^2-1))/((x+1)*(x-1)*(x^2-1))+(-2*(x+1)*(x^2-1))/((x+1)*(x-1)*(x^2-1))+(-3*(x+1)*(x-1))/((x+1)*(x-1)*(x^2-1)) = 0
-1*(x-1)*(x^2-1)-2*(x+1)*(x^2-1)-3*(x+1)*(x-1) = 0
3*x-3*x^3-x^2-3*x^2+1+3 = 0
3*x-3*x^3-4*x^2+4 = 0
3*x-3*x^3-4*x^2+4 = 0
3*x-3*x^3-4*x^2+4
3*x*(1-x^2)-4*x^2+4
4*(1-x^2)+3*x*(1-x^2)
(3*x+4)*(1-x^2)
((3*x+4)*(1-x^2))/((x+1)*(x-1)*(x^2-1)) = 0
((3*x+4)*(1-x^2))/((x+1)*(x-1)*(x^2-1)) = 0 // * (x+1)*(x-1)*(x^2-1)
(3*x+4)*(1-x^2) = 0
( 1-x^2 )
-1*x^2 = -1 // : -1
x^2 = 1
x^2 = 1 // ^ 1/2
abs(x) = 1
x = 1 or x = -1
( 3*x+4 )
3*x+4 = 0 // - 4
3*x = -4 // : 3
x = -4/3
x in { 1}
x in { -1}
x = -4/3
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