Translations:Dictionary:Fourier series/72/es

$\int _{-T}^{T}f(t)\displaystyle e^{-i{\frac {m\pi t}{T}}}\;dt=\sum _{n=-\infty }^{\infty }c_{n}\int _{-T}^{T}\displaystyle e^{i{\frac {n\pi t}{T}}}\displaystyle e^{-i{\frac {m\pi t}{T}}}\;dt.$