why? only used the triangle formed by A, C1 and C2 and an arbituary (x,y)
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送交者: chouqilozi 于 2009-03-13, 09:55:57:
回答: 推倒出椭圆方程明显的用到了椭园是封闭的长短轴存在这些假设 由 HunHunSheng 于 2009-03-13, 09:45:39:
where A is the point where AC1=AC2=a, C1C2=2e.
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