Hi,

Im doing Fourier Series atm for an exam on monday!

And im stuck on intergration by parts.

X cosn (pi)= ?

...........2

Im prity sure it its get broken apart into X and cosn (pi)

.................................................. ....................2

so basically what im asking is what is the integral of Cosn (pi)is it2 Sin n (pi)

.................................................. ............................2 .................n

Sorry for the .... its the only way i could get it to line up correctly!!

thanks for your time and help