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在高中数学的学习中,我们常会遇到一些重要的规定.这些规定是对相关概念、定义、定理起补充说明或限制的作用的,切实理解,掌握这些规定,无疑对学好高中数学至关重要.可是,这些规定又往往不能引起同学们足够的重视,这就极易造成对相关知识及重点的疏漏。从而导致解题失误.如: 例1:若α是0-2π之间的角,且α=[5π/2-arcsin(-1)]·ctg[arctg(tg(89π/4))],则α是( )
In the study of high school mathematics, we often meet some important regulations. These rules are the supplements or limitations of related concepts, definitions, and theorems. Understanding and mastering these rules are undoubtedly important for the study of high school mathematics. However, these regulations often fail to attract sufficient attention from students, which can easily lead to omissions in relevant knowledge and priorities. This leads to problem solving. For example: Example 1: If α is between 0 and 2π, and α=[5π/2-arcsin(-1)]·ctg[arctg(tg(89π/4))], Then α is ()