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**1. Homework Statement**

Show that the function Log(-z) + i(pi) is a branch of logz analytic in the domain D* consisting of all points in the plane except those on the nonnegative real axis.

**2. Homework Equations**

**3. The Attempt at a Solution**

I know that log z: = Log |z| + iArgz + i2k(pi)

I'm not sure where to start with this question, any help would be greatly appreciated!

thanks :)