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## Homework Statement

[tex]\frac{z-1}{z+1}=i [/tex]

I found the cartesian form, z = i, but how do I turn it into polar form?

## The Attempt at a Solution

[tex] |z|=\sqrt{0^2+1^2}=1[/tex]

[tex]\theta=arctan\frac{b}{a}=arctan\frac{1}{0}[/tex]

Is the solution then that is not possible to convert it to polar form?