-(1-cos(pi/7))(1-cos(3pi/7))(1-cos(5pi/7))/((1+cos(pi/7))(1+cos(3pi/7))(1+cos(5pi/7)))-(1-cos(pi/7))(1-cos(3pi/7))(1-cos(5pi/7))/((1+cos(pi/7))(1+cos(3pi/7))(1+cos(5pi/7)))

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