Please help.
Expand $\frac{z}{(z^2 + 1)(z^2 + 4)}$ for $1 < | z | < 2$ in Laurent series.
Express as
$$\frac1{4 z} \left (1+\frac1{z^2} \right )^{-1} \left (1+\frac{z^2}{4} \right )^{-1}$$
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Express as
$$\frac1{4 z} \left (1+\frac1{z^2} \right )^{-1} \left (1+\frac{z^2}{4} \right )^{-1}$$