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