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