the definite integral的用法和樣例：
例句
- This paper gives a method to solve double integration by integral subsection integration.
本文給出了用定積分的分部積分法求解二重積分的一種方法。 - In this paper, reciprocation, frequently used in indefinite integral calculation, was applied in definite and broad integral calculation.
將不定積分計算中經(jīng)常使用的例代換，應用于計算多余定積分與廣義積分，在某些情況下，使計算大為簡(jiǎn)化。
