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x in (-oo:+oo)
(x^2)/(3^2)-((y^2)/(3^2)) = 1 // - 1
(x^2)/(3^2)-((y^2)/(3^2))-1 = 0
1/9*x^2 = -(-1/9*y^2-1) // : 1/9
x^2 = 9*(1-(-1/9*y^2))
x^2 = 9*(1/9*y^2+1) // ^ 1/2
abs(x) = 3*(1/9*y^2+1)^(1/2)
x = 3*(1/9*y^2+1)^(1/2) or x = -(3*(1/9*y^2+1)^(1/2))
x in { 3*(1/9*y^2+1)^(1/2), -(3*(1/9*y^2+1)^(1/2)) }
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