By a change of variables x(u,v) = uv, y(u, v) = $\frac{v}{u}$ in a double integral, the integrand f(x, y) changes to $\bigg(uv,\frac{v}{u}\bigg)\phi(u,v)$. Then $\phi$(u, v) is
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By a change of variables x(u,v) = uv, y(u, v) = $\frac{v}{u}$ in a double integral, the integrand f(x, y) changes to $\bigg(uv,\frac{v}{u}\bigg)\phi(u,v)$. Then $\phi$(u, v) is