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A double pendulum is a system consisting of two pendulums attached end to end. It is an example of a complex mechanical system that exhibits chaotic behavior. The first pendulum is fixed at one end and swings freely, while the second pendulum is attached to the end of the first pendulum and also swings freely. The double pendulum is notable for its rich dynamics; its motion depends on several factors, including the initial angles and velocities of each pendulum.