复数加法运算复杂，用硬件实现复数加法，需要使用数目众多的加法器，占用大量的面积。
Operation of plurality add is very complicated. In the design will numerous adders be used and large area will be consumed.
复数 算术 推导了正弦，余弦的加法公式。
We derive the addition formulas for sine and cosine from the arithmetic of complex numbers.
利用复数振型叠加法，这种求解方法能够得出结构动力响应的精确解。
The proposed approach can offer an exact solution for dynamic response of base-isolated structure, through using the complex mode superposition method.
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