Node types are double angle-bracketed.
节点类型用双层尖括号括起。
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。
Well, you have to use double Angle formulas.
这里需要用到二倍角公式。
Well, using, again, the double Angle formula.
再次利用二倍角公式。
I mean, here you just use a double Angle again and then you can get it.
这里再次用二倍角公式。
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。
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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