“Fourier cosine series”的概念、定义、翻译、参考文献-科学参考

单词	Fourier cosine series
释义	Fourier cosine series Mathematics Given a function f(x) on the interval 0<x<L the Fourier cosine series is defined as $\begin{array}{l} \frac{a_{0}}{2} + \sum_{n = 1}^{\infty} a_{n} cos (\frac{nπ x}{L}), \\ where a_{n} = \frac{2}{L} \int_{0}^{L} f (x) cos (\frac{n x}{L}) d x . \end{array}$ This defines an even function of period 2L.
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