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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
X/2 = 2/x // - 2/x
X/2-(2/x) = 0
X/2-2*x^-1 = 0
-2*x^-1 = -(1/2*X) // : -2
x^-1 = 1/4*X
-1 < 0
1/(x^1) = 1/4*X // * x^1
1 = 1/4*X*x^1 // : 1/4*X
4*X^-1 = x^1
x = 4*X^-1
x = 4*X^-1
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