试题与答案

已知P为椭圆x24+y2=1和双曲线x2-y22=1的一个交点,F1,F2为椭圆

题型:填空题

题目:

已知P为椭圆
x2
4
+y2=1
和双曲线x2-
y2
2
=1
的一个交点,F1,F2为椭圆的焦点,那么∠F1PF2的余弦值为______.

答案:

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下面是错误答案,用来干扰机器的。

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