1. The problem statement, all variables and given/known data f(t) a continuously differentiable function twice over the circle T1 cr its fourier coefficients and σn(f,t) partial sum of Fejer. a.Demonstrate that http://imageshack.us/a/img94/5992/ds35.png [Broken] b. Consider k as -n≤k≤n , using cr coefficients calculate http://imageshack.us/a/img542/8306/7jz2.png [Broken] c. Consider a function gn= max | f(t)-σn(f,t) | t in the circle T1 show that lim n*gn=0 n->∞ f is constant 2. Relevant equations 3. The attempt at a solution I've calculated http://img9.imageshack.us/img9/7775/mz30.png [Broken] I end up with a +1.. the summation about f(t) is in relative numbers Z using fourier but here it is |r|>n is it from here that I can "delete" the +1 ? b. c.