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## Homework Statement

The limit of ln([tex]\frac{1-\frac{ix}{z}}{1+\frac{ix}{z}}[/tex]) as x goes to 0

## The Attempt at a Solution

I am using taylor where f = [tex]\frac{1-\frac{ix}{z}}{1+\frac{ix}{z}}[/tex]

f'(0) -[tex]\frac{2i}{z}[/tex]

Is this correct? Can you take the derivative just as equations without imaginary numbers?

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