analytically calculate the ctfs for the square wave x2. you may find it helpful to first find a relationship between the signal and the symmetic square signal . use the ten lowest frequency nonzero ctfs coefficients of x2 to create the first 5 harmonic components individually. for example, if you have the positive and negative ctfs coefficients stored in the vectors apos k and aneg k, respectively, you could construct the first harmonic of the input as follows: