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