Applying theory to specific cases to analyse ideogical method of transformation of several problems, briefly problems the principle and significance of transformation method in monadic calculus.
扼要论述了化归的原则及意义，从理论和实例分析讨论了一元微积分中若干典型问题化归的基本方法。
The second method of transformation is an important but not-easy-to-master calculus method.
第二类换元法是一种既重要又不易掌握的积分方法。
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