1. The problem statement, all variables and given/known data We have a pendulum, with length 4a. It is placed between two rounded obstacles (see image) described by x = a(θ+sinθ) and z = a(-3-cosθ), wich disturb its natural movement. Find the equation of movement. https://www.dropbox.com/s/q1y4gzmnv0mm9c0/2014-01-27 20.19.03.jpg 2. Relevant equations x = a(θ+sinθ) and z = a(-3-cosθ) are the parametrized coordinates of the obstacles 3. The attempt at a solution I have no idea where to start.