Im taking This class EEL3135 and im very lost and confused as to how to study or where to find resources to understand the material. does anybody know of a good website for beginner signal analysis? or a good reference ebook etc to help me out with it? the ones i seen are far too advanced and complicated for the stuff we doing. 1. The problem statement, all variables and given/known data here is the problem im looking at. a.Determine a formula for x(t) as the real part of a sum of complex exponentials. b.what is the fundamental period for x(t) c.plot the spectrum for x(t) X(T)=sin^3(27PI t) 2. Relevant equations euler inverse cosθ=(e^θ+e^θ)/(2) i dont really understand why we use this formula 3. The attempt at a solution i started for first expansion i got (-e^54pit)/4 +0.5+(e^-54pit)/4 after third expansion i got (-e^81pit)/(8j)+(3e^27pit/8j)+(-3e^27pit)/(8j)+ (-e^81pit/8j) is there an easier way to do this than big expansion?