# Math Help - [SOLVED] contour integratiion\residue theorem ?

1. ## [SOLVED] contour integratiion\residue theorem ?

pleaase have a look at the attched picture.....plz tel me which method is wrong , why? if both r correct...why r the answers different?
thank u for any help u can provide/...

2. You haven't finished "method 1". You cite as your answer
$-18\left[e^{4i\pi}- 1\right]+ 2\pi i$
Surely you know that $e^{4i\pi}= 1$?

Your two answers are exactly the same.

3. oh just had to expand it to sin and cos..............thank you.....