1. The problem statement, all variables and given/known data Find the sum of starts at 0 to infinity ∑ (cos(k*pi))/pi^k First, I determined that it does, indeed, converge with the alternating series test. Second, I found the answer to be pi/(1+pi) via wolfram alpha. But I am at a loss on how to find the answer here. This is a geometric series, so I am trying to find the r value. If I can do that, then I can use the trick of first term/(1-r) Correct?