how to slove this question?
If two periodic signals x(t) and y(t) are to be combined in different ways (mentioned below), then how can the Fourier series of resultant signal z(t) can be expressed in terms of Fourier series of x(t) and y(t)? The periodic signals are to be combined as follows:
a. z(t)= x(y)+y(t)
b. z(t)= x(y).y(t)
c. z(t)= x(y)*y(t)
If two periodic signals x(t) and y(t) are to be combined in different ways (mentioned below), then how can the Fourier series of resultant signal z(t) can be expressed in terms of Fourier series of x(t) and y(t)? The periodic signals are to be combined as follows:
a. z(t)= x(y)+y(t)
b. z(t)= x(y).y(t)
c. z(t)= x(y)*y(t)