The focal coordinate is (0, root number 3), that is, there is c= root number 3, and the distance from a focal point to the nearest vertex is root number 3- 1, that is, there is c-a= root number 3- 1.

So there is a= 1. b^2=c^2-a^2=3- 1=2

So the equation is y 2/1-x 2/2 =1.

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