Node types are double angle-bracketed.

节点类型用双层尖括号括起。

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Using approximate section properties, practical formulas are derived for single and double angle sections.

利用截面特性的近似值得出单角钢和双角钢构件的实用计算公式。

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Double Angle formula can transform the circular function equation to a biquadratic algebraic equation, and the analysis solution can be solved by extract equation directly.

用倍角公式可将该三角函数方程转化成一个四次代数方程，然后用求根公式直接求出解析解。

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Double Angle formula can transform the circular function equation to a biquadratic algebraic equation, and the analysis solution can be solved by extract equation directly.

用倍角公式可将该三角函数方程转化成一个四次代数方程，然后用求根公式直接求出解析解。

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