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正余弦定理是高中阶段数学比较重要的定理,这部分内容在人教版的教材中安排于必修5,即学生完整学习完必修4中的三角函数之后,应当说教材安排非常科学。这两大经典定理是解三角形的主要依据,正是由于两大定理本身巨大的功能,产生了非常重要的变式及相应的解题方法,同时也使学生的学习出现一定的困难,尤其是多解的情况更是让很多人摸不着头脑。于是很多教辅资料对这两大定理的应用做了梳理,为学生较好地掌握这些定理起
The sine cosine theorem is a more important theorem in high school mathematics. This part is arranged in compulsory textbook of PEP 5, that is to say, the students should complete the learning of the trigonometric functions in Compulsory 4 and should say that the textbook arrangement is very scientific. These two classic theorems are the main basis for solving triangles. It is precisely because of the enormous functions of the two theorems, which have produced very important variants and corresponding solutions to problems. At the same time, they also make students’ learning difficult, especially More solutions to the situation is that many people puzzled. So a lot of supplementary information on the application of these two theorems have been sorted out, for students to better grasp these theorems