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integral from 0 to 3 integral from 0 to (4-4x/3) of (3pi/2 - arctan((4-y)/x) - arctan((3-x)/y))/(12pi) dy dx
integral from 0 to 3 integral from 0 to (4-4x/3) of (3pi/2 - arctan((4-y)/x) - arctan((3-x)/y))/(12pi) dy dx
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