If you are a student or professional in the field of electronic communications using the fourth edition of Tomasi's textbook, I highly recommend using the "Solucionario Sistemas de Comunicaciones Electrónicas 4ta Edición Wayne Tomasi" as a study guide and solution manual. However, be sure to use it in conjunction with the main textbook to gain a deeper understanding of the subject matter.
Un buen solucionario no solo da la respuesta final, sino que explica el procedimiento, las fórmulas utilizadas y las simplificaciones asumidas. If you are a student or professional in
2.1 Find the Fourier transform of a rectangular pulse. sino que explica el procedimiento