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This is a tricky domain because, unlike simple arithmetic, to solve a calculus problem - and in particular to perform integration - you have to be smart about which integration technique should be used: integration by partial fractions, integration by parts, and so on.
这是一个棘手的领域，因为与简单的算术不同，要解决微积分问题——尤其是要执行积分——必须明智地选择应该使用哪种积分技术:分部积分、分部积分，等等。