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D( X )
X = 0
X+1 = 0
X = 0
X = 0
X+1 = 0
X+1 = 0
X+1 = 0 // - 1
X = -1
X in (-oo:-1) U (-1:0) U (0:+oo)
1/(X+1) = 1/X+1+2 // - 1/X+1+2
1/(X+1)-(1/X)-2-1 = 0
1/(X+1)-X^-1-2-1 = 0
1/(X+1)-1/X-2-1 = 0
(1*X)/(X*(X+1))+(-1*(X+1))/(X*(X+1))+(-2*X*(X+1))/(X*(X+1))+(-1*X*(X+1))/(X*(X+1)) = 0
1*X-1*(X+1)-2*X*(X+1)-1*X*(X+1) = 0
-2*X^2-X^2-2*X-X-1 = 0
-3*X^2-3*X-1 = 0
-3*X^2-3*X-1 = 0
-1*(3*X^2+3*X+1) = 0
3*X^2+3*X+1 = 0
DELTA = 3^2-(1*3*4)
DELTA = -3
DELTA < 0
-1 = 0
-1/(X*(X+1)) = 0
-1/(X*(X+1)) = 0 // * X*(X+1)
-1 = 0
X belongs to the empty set
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