Question

integration of 1/z^2

Answer 1

http://www.wolframalpha.com/input/?i=int+1%2Fz^2

Answer 2

-1/z +c

Answer 3

if u integrate w.r.t. z

Answer 4

The answer is
(-1/z) + c
because we can rewrite
1/z^2
as
z^(-2)
and it is a lot easier to see from there on