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{ (1 / 2) - [ -(1 / 2)·tan(60°) ] }^2 + { [ (1 / 2)·tan(60°) ] - (1 / 2) }^2 =
{ (1 / 2) - [ -(1 / 2)·tan(60°) ] }^2 + { [ (1 / 2)·tan(60°) ] - (1 / 2) }^2 =
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