# Evaluate the integrals without using tables: \int_{-\infty}^{\infty}\frac{2x dx}{(x^{2}+1)^{2}}

The integrals converge. Evaluate the integrals without using tables.
${\int }_{-\mathrm{\infty }}^{\mathrm{\infty }}\frac{2xdx}{{\left({x}^{2}+1\right)}^{2}}$
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