I need help with this integral

[pinkythekitcat]

Hello all, I had this integral on my exam and I don't know how to solve that kind, if you could help me a bit that would be very nice.

 

[Deleted member 4993]

Hello all, I had this integral on my exam and I don't know how to solve that kind, if you could help me a bit that would be very nice.

\(\displaystyle \int_0^{2\pi} \frac {1+sin(\frac{x}{3})}{2*x*cos^4(\frac{x}{3})} dx\)

First substitute u =x/3 .....don't forget to change the limits

continue....

Please show us what you have tried and exactly where you are stuck.

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