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Diketahui $S$ merupakan belah ketupat yang titik-titik sudutnya \\((0,1)\\), \\((0,-1)\\), \\((\\var{a},0)\\), dan \\((-\\var{a},0)\\). 

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Dengan perubahan variabel yang tepat, integral \\(\\displaystyle \\iint_S (x+\\var{a}y)^3e^{x-\\var{a}y}\\,dA\\) akan sama dengan $\\ldots$.

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