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maths integrations through substitution

im really stuck and got no idea on how to do the final part of this

https://imgur.com/a/C1uXyxu
Reply 1
Looks like it builds on the previous parts, but sqrt(x^2-4) is not x-2. Use the suggested substitution and a trig identity, similar to the previous part.
(edited 5 months ago)

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