1. The problem statement, all variables and given/known data hello, i have to find the limit of the next array (xn)=(cos (π/n+1) + cos (π/n+2) + .....+ cos ( π/2n))/n when n goes to infinity. 2. Relevant equations I was told to apply stolz cesaro and that is where i ended up : the limit is : limit of cos ( π/2n+1) + cos (π/2n+2) -cos (π/n+1) 3. The attempt at a solution How i finish this ?