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x in (-oo:+oo)
(x^2)/16-((y^2)/16) = 1 // - 1
(x^2)/16-((y^2)/16)-1 = 0
1/16*x^2 = -(-1/16*y^2-1) // : 1/16
x^2 = 16*(1-(-1/16*y^2))
x^2 = 16*(1/16*y^2+1) // ^ 1/2
abs(x) = 4*(1/16*y^2+1)^(1/2)
x = 4*(1/16*y^2+1)^(1/2) or x = -(4*(1/16*y^2+1)^(1/2))
x in { 4*(1/16*y^2+1)^(1/2), -(4*(1/16*y^2+1)^(1/2)) }
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