Hi

Another question, not mine this time

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Say we want to compute

Integration by parts :

So

???

What went wrong ?

(I know we can recognize -ln(cos(x))

Now, there is the same problem with the integration by parts if we want to compute (I mean for a definite integral)

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Another integral :

How would you go about this one ? :P

Apart from the Weierstrass substitution or complex analysis...

Thaaaaaaaaank you