1. In this course, the teacher will explain various mathematical concepts, such as arithmetic, algebra, geometry, probability statistics, etc., so that students can have a deeper understanding of mathematics, make students more interested in the theory and practice of this course, and mobilize students' enthusiasm in class at once, from which they can learn difficult knowledge points in sine theorem.
2. Sine theorem is the key and difficult point in teaching, focusing on the discovery and proof of sine theorem and its simple application. The difficulty in teaching is the process of putting forward the sine theorem conjecture. Preparation in teaching: make multimedia courseware, and students prepare calculators, rulers and protractors.