Consider the signal shown below.
Which of the following represents the Fourier series for the above signal.
1
\(\frac{{4j}}{{n\pi }}\sin \left( {\frac{{n\pi }}{4}} \right)\sin \left( {\frac{{n\pi }}{2}} \right){e^{ - jn\frac{\pi }{4}}}\)
2
\(\frac{{ - 4j}}{{n\pi }}\sin \left( {\frac{{n\pi }}{6}} \right)\sin \left( {\frac{{n\pi }}{2}} \right){e^{ - jn\frac{\pi }{3}}}\)
3
\(\frac{{ - 4j}}{{n\pi }}\sin \left( {\frac{{n\pi }}{4}} \right)\sin \left( {\frac{{n\pi }}{2}} \right){e^{ - jn\frac{\pi }{4}}}\)
4
\(\frac{{4j}}{{n\pi }}\sin \left( {\frac{{n\pi }}{6}} \right)\sin \left( {\frac{{n\pi }}{2}} \right){e^{ - jn\frac{\pi }{3}}}\)