<m>S(f)(t)=a_{0}+sum{n=1}{+infty}{a_{n} cos(n omega t)+b_{n} sin(n omega t)}</m> <m 8>delim{lbrace}{matrix{3}{1}3x-5y_z_0_sqrt_2_x-7y_8z_0_x-8y_9z_0}{ }</m> <m 32>delim{|}1_n_sum_n_1_n_gamma_u_n_-_1_2_pi_int_0_2_pi_gamma_t_dt{|} ⇐ epsilon/3</m>