利用分部积分法巧解二次积分

Use the Integration by Parts to Solve Two Definite Integral

根据被积函数的特征分四种情形分别进行讨论,给出了不需转换积分区域D类型交换积分次序而使用分部积分法计算二次积分的方法,首次将分部积分法成功地引入到二重积分的计算中。

According to the characteristics of integral function has been sub-four cases were discussed,without conversion points are given the type of regional D exchange of the order in which the use of integration by parts integral method to calculate the second integral method,the success of integration by the introduction of the two weight points calculation.