biquadratic algebraic equation
... bipyramid 双棱锥 biquadratic algebraic equation 双二次代数方程 biquadratic curve 双二次曲线 ...
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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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