# Math Help - complex line integration question

1. ## complex line integration question

Would appreciate much if someone could help with the below question

Show that $\int_C f = 0, where$$C : \left | z \right | = 1$ , and

i)
$f(z) = \tfrac{z - 2}{cos z}$

2. ## Re: complex line integration question

What are the poles of $f(z)$? Is $f(z)$ analytic within the contour? If so what is the integral of $f$ over that contour?