1) sine: 1 plus tangent square divided by tangent times. ?

Pay attention to the meaning of' points'. ?

2) Cosine: Compared with Yin and Yang, it is cosine. ?

Explanation: Does' Yin' in chemistry mean'-',while' Yang' means'+'?

3) Tangent: Just use the ratio of sine to cosine.

Doing problems is to consolidate knowledge and improve adaptability, thinking ability and computing ability. Learning mathematics requires some exercises, but learning mathematics does not mean doing problems. In all kinds of exam questions, a considerable number of exercises can be solved through the accumulation of simple knowledge points and the deduction of axiomatic knowledge system These exercises are to expand the problem-solving methods by doing a certain amount of exercises. But with the reform of the college entrance examination, the college entrance examination has focused on the examination of creativity and ability.

Extended data:

The main purpose of mathematics learning is to cultivate our creativity and our ability to deal with things and solve problems. Therefore, when dealing with mathematical problems, it is particularly important to master big strategies and big thinking, and we should pay attention to summing up in our usual study.

Usually in class, a knowledgeable student should listen to the teacher's analysis and induction of the topic. However, there are still many students who don't pay attention to the teacher's analysis and often remain calm during every step of calculation and deduction explained by the teacher. Listening to the class is very serious, but it is very laborious. After listening, it's all a calculation process, fragmented.

The teacher's analysis is to guide students to think and inspire them to design big strategies and big thinking to deal with these problems. When the teacher answers the exercises, students should use their own calculations and reasoning to know what the teacher is going to do.

Baidu encyclopedia-trigonometric function (mathematical term)