By constructing a convergent power series solution of an auxiliary equation, analytic solutions for the original equation are obtained.
讨论了一阶迭代微分方程解析解的存在性，通过构造一个辅助方程的幂级数解给出该方程的解析解。
Further, by double FOURIER series expansion and intricate derivation, strict output analytic solution is acquired.
针对模型，通过双fourier级数展开和繁琐的数学推导，求得了输出电压的严格解析表达式。
Further, by double FOURIER series expansion and intricate derivation, strict output analytic solution is acquired.
针对模型，通过双fourier级数展开和繁琐的数学推导，求得了输出电压的严格解析表达式。
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