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D( x )
x = 0
x^2 = 0
x = 0
x = 0
x^2 = 0
x^2 = 0
1*x^2 = 0 // : 1
x^2 = 0
x = 0
x in (-oo:0) U (0:+oo)
X/(x^2) = -1/x // + -1/x
X/(x^2)-(-1/x) = 0
X/(x^2)+x^-1 = 0
X*x^-2+x^-1 = 0
x^-1*(X*x^-1+1) = 0
X*x^-1 = -1 // : X
x^-1 = -1/X
-1 < 0
1/(x^1) = -1/X // * x^1
1 = (-1/X)*x^1 // : -1/X
-X = x^1
x = -X
1/x = 0
1*x^-1 = 0 // : 1
x^-1 = 0
x należy do O
x = -X
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