解题方法
1 . Cassini卵形线是由法国天文家Jean-DominiqueCassini(1625-1712)引入的.卵形线的定义是:线上的任何点到两个固定点
,
的距离的乘积等于常数
.
是正常数,设
,
的距离为
,如果
,就得到一个没有自交点的卵形线;如果
,就得到一个双纽线;如果
,就得到两个卵形线.若
,
.动点
满足
.则动点
的轨迹
的方程为___________ ;若
和
是轨迹
与
轴交点中距离最远的两点,则
面积的最大值为___________ .
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