How I can show the following(adsbygoogle = window.adsbygoogle || []).push({});

[tex] \int _{\mathbb{T}} \frac{1}{|1-e^{-i\theta}z|^2}dm(e^{i\theta})= \frac{1}{1-|z|^2} ,[/tex]

where z is in the unit disc

dm is the normalized Lebesgue measure and

T is the unite circle.

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# Integral on the circle

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