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六年制重点中学高中数学课本《代数》第一册复习参考题五A组有这样一道题: 如果α,β,γ都是锐角,并且它们的正切依次
Six-year key high school mathematics textbook “Algebra” in the first volume review reference question five A group has such a question: If α, β, γ are all acute angles, and their tangent