Fourier series

• Even and Odd Fourier Series for f(x) = π − x on (0, π)
  Find the half-range cosine and sine Fourier series of f(x) = π − x on (0, π), with coefficient calculations, convergence details, and a check.
• What Is the Fourier Series of a Square Wave?
  For a symmetric square wave of amplitude ±A and period T, the Fourier series contains only odd sine harmonics, with coefficients decreasing as 1/n.