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由某角的一个三角函数值求某角,教材(全国统编教材高中《代数》(甲种本)第一册,以下同)上分两种情况讲述,一种含附带条件,另一种不含附带条件,对这两种情况,教材上各举了两个例子,力图
A trigonometric function of a certain angle is used to determine a certain angle. Textbooks (National Algebra) (Alphanumeric) (Volume 1) are described in two cases. One contains conditions and the other Excluding incidental conditions, for each of these two cases, two examples were given