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The equation of the ellipse that has a center at ` (8,3) `, a focus at ` (5 , 3) `, and a vertex at ` (13 , 3 ) `, is
` \frac((x-C)^2)(A^2)+\frac((y-D)^2)(B^2)=1 `
where
` A = `  
` B = `  
` C = `  
` D = `  

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