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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
2*x-(y/x) = 0
2*x-(x^-1*y) = 0
x^-1*(2*x^2-y) = 0
2*x^2 = y // : 2
x^2 = y/2
x^2 = y/2 // ^ 1/2
abs(x) = (y^(1/2))/(2^(1/2))
x = (y^(1/2))/(2^(1/2)) or x = -((y^(1/2))/(2^(1/2)))
1/x = 0
1*x^-1 = 0 // : 1
x^-1 = 0
x należy do O
x in { (y^(1/2))/(2^(1/2)), -((y^(1/2))/(2^(1/2))) }
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