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How I can convert this double integral into line $\int \int \frac{dx dy}{y^2} $ we have $\frac{dQ}{dx}-\frac{dP}{dy}=\frac{1}{y^2}$ how to find $Q, P$ functions? Any two functions works? $P=1, Q=\frac{x}{y^2}$?

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    $\begingroup$ Yes, any two do the work. $\endgroup$ – Rafa Budría Dec 3 '18 at 14:39

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