質問: in any `deltaabc`, prove that `(c^(2)-a^(2)+b^(2))tana=(a^(2)-b^(2)+c^(2))tanb=(b^(2)-c^(2)+a^(2))tanc` in any `deltaabc`, prove that `(c^(2)-a^(2)+b^(2))tana=(a^(2)-b^(2)+c^(2))tanb=(b^(2)-c^(2)+a^(2))tanc`
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