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DLMF:1.8#Ex1 - MaRDI portal

DLMF:1.8#Ex1 (Q225)

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DLMF:1.8#Ex1
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    a n = 1 π - π π f ( x ) cos ( n x ) d x , subscript 𝑎 𝑛 1 𝜋 subscript superscript 𝜋 𝜋 𝑓 𝑥 𝑛 𝑥 𝑥 {\displaystyle{\displaystyle a_{n}=\frac{1}{\pi}\int^{\pi}_{-\pi}f(x)\cos\left% (nx\right)\mathrm{d}x,}}
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    n = 0 , 1 , 2 , 𝑛 0 1 2 {\displaystyle{\displaystyle n=0,1,2,\dots}}
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