Teacher2Teacher 
Q&A #4268 
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From: Molly Spier To: Teacher2Teacher Public Discussion Date: 2000101913:56:30 Subject: calculus My students are taught to use substitution only when the integration problem seems to be too complicated or to simplify problems which have radicals. I direct them to recognize the use of integration by parts when there is a variable which will reduce to a constant after taking the derivative of it one or more times orif there are functions whose derivatives are of a cylic nature such as cosine, sine, or exponential functions, then they are directed towards integration by parts.
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