We arrived at Formula 6.3.2, by using cylindrical shells, but now we can use integration by parts
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by using cylindrical shells, but now we can use integration by parts to prove it using the slicing method of Section 6.2, at least for the case where f is one-to-one and therefore has an inverse function . Use the figure to show that
Make the substitution y = f(x) and then use integration by parts on the resulting integral to prove that
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Txf(x) dx 2π xf(x) dx x=g(y) y=f(x) x=b Ct
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