第二类换元积分法在《高等数学》教学中是重点,亦是难点,本文想通过两种解题方式的介绍,使同学们拓展思路,更简单的利用三角代换解决问题。 The second kind of redeeming integral method is the key point in the teaching of advanced mathematics, which is also a difficult point. This article wants to introduce the two ways to solve the problem so that the students can expand their thinking and solve the problem more simply by using the triangular substitution.