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关于基本三角函数的定义域已为大家所热知,但异于基本三角函数的定义域的求法,因课本既无专章叙述,也无例题,学生普遍感到困难。本文按函数关系式的
The definition of the basic trigonometric function has been known to everyone, but it is different from the definition method of the basic trigonometric function. Because the textbook has neither a specific chapter nor an example, the students generally feel difficult. This article is based on functional relations