Let f be the triangle wave function defined by f(x): = ?-|x| for -?

Let f be the triangle wave function defined by f(x) T for T < T, and extended to be 2T-periodic on the real number line. Find the Fourier series of this function in complex exponential form. You should verify the Fourier coefficients of f are: 2/ (7rn2) if n 0 if n # 0 and even if n is odd