v 2.29

f (x) = \frac{1}{2} a_{0} + \sum_{n = 1}^{\infty} (a_{n} \cos (n x) + b_{n} \sin (n x))

${f(x) = \frac{1}{2} a_0 + \sum_{n=1}^\infty (a_n \cos (nx) + b_n \sin (nx))}$

Error