x(n)=cos(n/3)cos(pi*n/3)
The cos times cos is throwing me off. I know how to determine if signal is periodic if I have one cos. How do I do it when I have product of two cos? Do I determine for each cos and if one is not periodic, then the whole thing is not periodic? Is that it?
The cos times cos is throwing me off. I know how to determine if signal is periodic if I have one cos. How do I do it when I have product of two cos? Do I determine for each cos and if one is not periodic, then the whole thing is not periodic? Is that it?