(b^2-c^2)/cos b+cos c+(c^2-a^2)/cos c+cos a+(a^2-b^2)/cos a+cos b=0

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(b^2-c^2)/cos b+cos c+(c^2-a^2)/cos c+cos a+(a^2-b^2)/cos a+cos b=0

(b^2-c^2)/cos b+cos c+(c^2-a^2)/cos c+cos a+(a^2-b^2)/cos a+cos b=0

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