1, if LIMF (x) = c and x tends to infinity, there is a horizontal asymptote y = c；;

2. If limf(x)= infinity and X tends to X, there is a vertical asymptote x = x

In addition, if limf(x)/x=k is not equal to 0, X tends to infinity, lim(f(x)-kx)=b, and X tends to infinity, then some asymptotes Y = KX+B.

When a point m on a curved line is infinitely far from the origin or infinitely close to the discontinuous point on the curve, if the distance from m to a straight line approaches to zero infinitely, the straight line is called the asymptote of this curve. Asymptotes are divided into vertical asymptotes, horizontal asymptotes and inclined asymptotes; It should be noted that not all curves have asymptotes, and asymptotes reflect the changes of some curves when they are infinitely extended.

So, what are the learning methods?

1, preview

Preview is a very important learning method. Through preview, you can get familiar with the content and structure of the article. In the process of preview, you can mark out what you don't understand, so that you can take questions with you in class, so that you can listen to lectures in a targeted manner and improve your interest and efficiency in learning.

2. Take notes in class

Listening to lectures is an important way for people to receive information. People can learn most of the content in the process of listening to lectures, so it is very important to grasp the content of lectures well. Be sure to pay attention, listen to the teacher's explanation, take notes actively, and participate in classroom activities and actively answer the questions raised by the teacher.

Step 3 do your homework carefully

After class, the teacher will give the students homework. The purpose of doing homework is to further consolidate what we have learned in class. Therefore, we must take our homework seriously.

Step 4 Review and summarize

Be sure to review and summarize after learning. By reviewing and summarizing, we can make what we have learned our own knowledge, and find new problems in reviewing and summarizing, so as to further deepen our understanding of knowledge points.

5. Stay confident

Self-confidence can bring great motivation to people. With self-confidence, we can make our daily study more energetic and better remember the content of our study.