解题方法
1 . 在正四棱锥
中,底面边长为
,侧棱长为
,点P是底面ABCD内一动点,且
,则当A,P两点间距离最小时,直线BP与直线SC所成角的余弦值为( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/faeb97acf19bd3b2c6c77c2814df4d2f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/95bacae35b6e16a0a33c2bdc6bc07df7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b8860d9787671b53b1ab68b3d526f5ca.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a55dee136404fc3f6fea25795749c6e0.png)
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