右顶点为A(1,0),a = 1
如果焦点在x轴:则过(c,1/2)点
c^2 + 1/4b^2 = 1 - b^2 + 1/4b^2 = 1
-4b^4 + 2b^2 = 0 b^2 = 1 /2
如焦点在y轴,则过 (1/2,c)
1/4 + (b^2-1)/b^2 = 1 b^2 = 4
右顶点为A(1,0),a = 1
如果焦点在x轴:则过(c,1/2)点
c^2 + 1/4b^2 = 1 - b^2 + 1/4b^2 = 1
-4b^4 + 2b^2 = 0 b^2 = 1 /2
如焦点在y轴,则过 (1/2,c)
1/4 + (b^2-1)/b^2 = 1 b^2 = 4