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u=((pi^3/40)^2)*(1/4-(1/2-x)^2)(1/4-(1/2-y)^2) from x=0 to 1 y=0 to 1
u=((pi^3/40)^2)*(1/4-(1/2-x)^2)(1/4-(1/2-y)^2) from x=0 to 1 y=0 to 1
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