# Calculate the double integral. \int \int_R \frac{4x}{1+xy}dA R=\left[0,4

Calculate the double integral.
$$\displaystyle\int\int_{{R}}{\frac{{{4}{x}}}{{{1}+{x}{y}}}}{d}{A}$$
$$\displaystyle{R}={\left[{0},{4}\right]}\times{\left[{0},{1}\right]}$$

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