1. The problem statement, all variables and given/known data Find all points of intersection of the given curve. 2. Relevant equations r = 1 - cos θ, r = 1 + sin θ 3. The attempt at a solution 1 - cos θ = 1 + sin θ 1 = 1 + sin θ + cos θ 0 = sin θ + cos θ After that step, I blank out and can't think about how to get any further on just looking for θ = ?