This was the the problem i was give and it asks to integrate around the contours center a=-2, a=0, a=2 and radius 1.

i) a=-2 gives and answer of 0 because it is holomorphic everywhere

ii) a=0 gives and answer of

iii) a=2 gives and answer of 0 as , when , =

could some please check my working for me as am a bit confused about around the contours.

thanks bobisback