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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
x-((3*y)/x) = 0
x-3*x^-1*y = 0
x-3*x^-1*y = 0
x^-1*(x^2-3*y) = 0
1*x^2 = -(-3*y) // : 1
x^2 = 3*y
x^2 = 3*y // ^ 1/2
abs(x) = 3^(1/2)*y^(1/2)
x = 3^(1/2)*y^(1/2) or x = -(3^(1/2)*y^(1/2))
1/x = 0
1*x^-1 = 0 // : 1
x^-1 = 0
x naleu017Cy do O
x in { 3^(1/2)*y^(1/2), -(3^(1/2)*y^(1/2)) }
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