This question is not difficult. The key is the combination of numbers and shapes. First, it is easy to find the coordinates of point B (3,0), then the coordinates of m, n (- 1 0) and (1 0), and then set the coordinates of point P as (cosa, sina), and then express other points! See Baidu Library below for specific answers.

20 13 Questions and Answers on Mathematics and Science of the Second Model Exam in Jiaxing _ Baidu Library

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