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