How do you find the integral of sqrt[1+81x]? u-substitution and integration by parts does not seem to work.
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Originally Posted by virtuoso735 How do you find the integral of sqrt[1+81x]? u-substitution and integration by parts does not seem to work. It should . Let . Your problem reduce to
On the contrary, u-sub does work. Try But for such a trivial integral, it's best to see it as and integrate directly. Are you sure you did not mean instead?
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