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(2*integrate y^2 dy dx, x=-a/2..0, y=0..sqrt(3)*(x+a/2)) + (sqrt(3)/4*a^2)*(a/(2*sqrt(3)))^2
(2*integrate y^2 dy dx, x=-a/2..0, y=0..sqrt(3)*(x+a/2)) + (sqrt(3)/4*a^2)*(a/(2*sqrt(3)))^2
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