Fourier Series
x ( t ) = / s u m [ − i n f i n f ] a n c o s ( ( 2 / p i m t ) / t ) {\displaystyle x(t)=/sum[-infinf]a_{n}cos((2/pimt)/t)}
![{\displaystyle x(t)=/sum[-infinf]a_{n}cos((2/pimt)/t)}](https://wikimedia.org/api/rest_v1/media/math/render/svg/82f6394aaf1497c6f165062684f60731568e81f9)