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The vertex of a parabola is the point (a...

The vertex of a parabola is the point `(a , b)` and the latus rectum is of length `ldot` If the axis of the parabola is parallel to the y-axis and the parabola is concave upward, then its equation is `(x+a)^2=1/2(2y-2b)` `(x-a)^2=1/2(2y-2b)` `(x+a)^2=1/4(2y-2b)` `(x-a)^2=1/8(2y-2b)`

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