What is the equation for an ellipse with a center at the origin and one focus st(1,1)and the length of the semimajor axis is 4.?

What is the equation for an ellipse with a center at the origin and one focus st(1,1)and the length of the semimajor axis is 4.?
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Use the standard form (x−h)2a2+(y−k)2b2=1 ( x − h ) 2 a 2 + ( y − k ) 2 b 2 = 1 . If the x-coordinates of the given vertices and foci are the same, then the major axis is parallel to the y-axis. Use the standard form (x−h)2b2+(y−k)2a2=1 ( x − h ) 2 b 2 + ( y − k ) 2 a 2 = 1 .
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