I would like to evaluate this integral using u substitution, I tried let u = sin x but that did not seem to do anything, should I be changing the sec^2x - 1 to something else? Any help is appreciated!
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Originally Posted by DarK I would like to evaluate this integral using u substitution, I tried let u = sin x but that did not seem to do anything, should I be changing the sec^2x - 1 to something else? Any help is appreciated! In integrals like this the following substitution works 'almost always'... Kind regards
sec(x)= 1/cos(x) so sec^2(x)= 1/cos^2(x). I presume you know how to "change" cos(x) into sin(x).
Let . That substitution kills the integral on one-go.
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