The method of the definite integral by substitution is one of the main techniques among the definite integral calculation.
定积分换元法是定积分计算的主要方法之一。
The integration by second substitution is an important method of calculating indefinite integral, it has a certain application, it usually applies to calculate some integrals of irrational function.
第二换元积分法是求函数不定积分的一种重要方法，具有一定的适用范围，对某些无理函数的积分的求解通常使用该方法。
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