Sum of n/2^n*cos(n*pi/3) using complex numbers

We will see how to evaluate the infinite series of n/2^n*cos(n*pi/3) by using Euler’s formula 0:00 The trick is to use complex numbers 5:44 The simplification https://www.youtube.com/watch?v=pwjPfuRvP6M If the question is to evaluate the series of n/2^n, then we can do this: https://www.youtube.com/watch?v=Ch9uCBm-kUE Support this channel and get more content 👉 https://www.patreon.com/blackpenredpen Big thanks to my Patrons for the full-marathon support! Ben D, Grant S, Mark M, Phillippe S. Michael Z, Jan P. Devun C. Stefan C. Ethan BW Didion S. NN Minkyu Y Brandon F Levon M shortsleeve Jack P Gabriel G Yeeted C David H Mateo F Emma M Eden E Minicat Jose R Nicholas Fey Tyler B Lucas W Ahmet Ö An R Camila L Luupo Farrah Batman 1127 Mathguru Дмитрий П. Michelle L. Alin V. Archer. L Ali. Subotai B. Spencer A. Chris Jason B. Ou S. Nuddi M. Jackson M. Jordan T. Gregorio B. Omkar N. John D. Zero Jeffrey C J D Chaz W. Ryan Turbo S Arcana Rehan M Lukasz M NaiKang W Kevin Y Gamesh K kelvin P 형우 박 Minda W Erik P Sebastian C Ryan M Billy J Kian S Stormm HOm3l3ss b Nathan Y Aidyn R 🛍 Shop my math t-shirt & hoodies: https://amzn.to/3qBeuw6 #blackpenredpen #math #calculus #mathtutorials