Residue approximation theorem of n-times integrated C cosine function is gained by confining the resolvent and using Cauchy-residue theorem and Laplace inverse transformations of cosine functions.%通过限制预解式,利用 Cauchy 留数定理和余弦函数的 Laplace 逆变换得到指数有界的 n 次积分 C 余弦函数的留数型逼近式。
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