determinar la ecuadion canionica de la circunferencia a partir de la ecuacion general
[tex] {x}^{2} + {y}^{2} - 2x - 3 = 0[/tex]
[tex] {x}^{2} + {y}^{2} - 4y = - 3 [/tex]
[tex] { x }^{2} + {y}^{2} + 4x + 2x = 4[/tex]
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