To begin, choose a wave form to approximate, either a square, sawtooth, or triangle wave. Next, choose
which series to perform, Fourier, or Legendre series. Then enter the number of terms to compute in the series.
You can swtich between the two types of series to see how they compare. Note: You can also see some
of Gibbs phenomenon in how the approximate series overshoots the edges of the square wave.