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Question Number 105734 by bemath last updated on 31/Jul/20 | ||
$$\left(\mathrm{2}{x}+\left({x}^{\mathrm{2}} +{y}^{\mathrm{2}} \right)\mathrm{cot}\:{x}\right)\:{dx}\:+\mathrm{2}{y}\:{dy}\:=\:\mathrm{0} \\ $$ | ||