[积分] 星形线参数式

楼主: barry881028 (Joker)   2019-02-13 16:27:39
请问此题的第二小题的星形线参数式是如何得到的呢??
https://i.imgur.com/vxURpKl.jpg
https://i.imgur.com/EeSsvxG.jpg

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