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