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Question Number 29851 by abdo imad last updated on 13/Feb/18

let give f(z)=((tanz −z)/((1−cosz)^2 ))  find Res(f,0).

$${let}\:{give}\:{f}\left({z}\right)=\frac{{tanz}\:−{z}}{\left(\mathrm{1}−{cosz}\right)^{\mathrm{2}} }\:\:{find}\:{Res}\left({f},\mathrm{0}\right). \\ $$

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