The holy grail. The solucionario contains fully worked solutions to the end-of-chapter problems. For a subject like Fourier analysis—where a sign error in an integral can ruin an entire transform—having a verified solution is invaluable for self-study.
You are likely looking for two or three items: The holy grail
Análisis de señales periódicas y descomposición en componentes sinusoidales. The holy grail