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笔者曾经阅读了许多报纸、杂志上有关三角函数周期性求法的文章, 发现一个关键的问题在文中都被忽略掉,下面通过实例警示大家．应用举例:
I have read many articles on the periodic method of trigonometric functions in many newspapers and magazines and found that a key problem was ignored in the text. The following example warns everyone. Application examples: