I am trying to revise some rules regarding the period of sines (or cosines) when (a) they are added , and (b) they are multiplied. I haven't had too much luck Googling this topic.
For example, what would be the fundamental period of:
y=cos(2.pi.2x) + cos(2.pi.3x)
Or, if we multiply:
People have suggested to me that I use trig. identities (or complex exponentials) but I am sure there is a more intuitive way such as considering the phases between both parts.
Any ideas appreciated !