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First, break the integral into two parts as
Using the substitution, the first integral becomes
while the second becomes
With the additional substitution , the final integral above becomes
so that the original integral is equal to
Curious as to how the hint was related
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Ah i was trying to hint at the fact one had to do another substitution. You had already done one, i was trying to tell you to do another one. Instead of switching to integration by parts. Maybe not the best hint ;)
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