用一道课本三角函数题的结论解题

SHU XUE JIAO XUE ›› 2017, Vol. 1 ›› Issue (7) : 34-37.

SHU XUE JIAO XUE ›› 2017, Vol. 1 ›› Issue (7) : 34-37.

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编辑单位：《数学教学》杂志编辑部
出版单位：华东师范大学出版社有限公司
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