8/п*(arctg(1/2)+arctg(1/3))
8/пи*(atan(1/2)+atan(1/3))
(8*atan(1/2)+8*atan(1/3))/пи
2
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8/пи*(atan(1/2)+atan(1/3))
(8*atan(1/2)+8*atan(1/3))/пи
2