This concept shouldn't be all that strange, actually. U-substitution is only one transformation technique, and in fact, you probably have already used other techniques of transformation to solve integration problems that haven't required the U-Substitution method. Here's an example: So this doesn't look too hard.
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Falls Creek, Pennsylvania. Falls Creek is a borough located in Jefferson and Clearfield counties in Pennsylvania in the United States. The population was 1,037 at the 2010 census. Of this, 989 were in Jefferson County, and only 48 were in Clearfield County. Contents.