Formula:225

Digital Library of Mathematical Functions ID 1.8#Ex1

${\displaystyle{\displaystyle a_{n}=\frac{1}{\pi}\int^{\pi}_{-\pi}f(x)\cos\left(nx\right)\mathrm{d}x,}}$

Constraint(s)

${\displaystyle{\displaystyle n=0,1,2,\dots}}$

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