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## Homework Statement

[tex]\oint_{L} \frac{ \mbox{d} z}{ z(z+3) }[/tex] and [tex]L:|z|=4[/tex]

## The Attempt at a Solution

what is assumption, is it oriented positive or negative? and Cauchy formula, can it be done like this?

[tex]\frac{ 1 }{ 3 } \left( \oint_{L} \frac{ \mbox{d} z}{ z } - \oint_{L} \frac{ \mbox{d} z}{ z+3 } \right)[/tex]