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.
应用三元数运算，推导得到了一般三次代数方程的求根公式，结果证明与卡尔丹公式是一致的。
Applying the operation on three ary number, we got the formula that was applied to seeking the roots of normally cubic equation, and proved that the result is consistent with Cardans formula.
利用一元二次方程的求根公式构造二元二次方程组的迭代算法，通过图解二元二次方程组的解来说明迭代算法在实践中的应用。
In this paper, the author gives the formula of roots of a quadric equation over a field of 2 k elements and presents the problem.
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