Fourier Series of f(x) = (1/12)(x^2 - π^2): Calculation and Graph

Graph of Function f(x) = (1/12)(x^2 - π^2) over Interval [-4π, 4π]

Fourier Series of f(x) = (π - x) / 2 over [0, 2π]

Fourier Series Expansion of f(x) = x + x^2 and Basel Problem Deduction

Fourier Series Integration Problem and Parseval's Theorem