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4·( π·4^2 / 4 - ( π·4^2·60° / 360° + ( π·4^2·60° / 360° -(1 / 2)·4^2·sin(60°) ) ) ) =
4·( π·4^2 / 4 - ( π·4^2·60° / 360° + ( π·4^2·60° / 360° -(1 / 2)·4^2·sin(60°) ) ) ) =
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