WAVEFORM GENERATION
If the Fourier series for f(t) is known then one can
easily  determine the expansion for any time-shifted
and time-scaled version of f(t)
Time scaling does not change the
values of the series expansion
Time-shifting modifies the phase of
the coefficients
The coefficients of a linear combination of signals are the linear combination of
the coefficients
One can tabulate the expansions for some basic waveforms and use them to determine
the expansions or other signals