Double pendulum
A double pendulum is a pendulum with another pendulum attached to its end, and is a simple physical system[?] that exhibits rich dynamic behavior[?]. The double pendulum is governed by very complicated formulas that can be found here (http://scienceworld.wolfram.com/physics/DoublePendulum.html). The double pendulum relates to:
A good double pendulum simulation (http://www.maths.tcd.ie/~plynch/SwingingSpring/doublependulum.html)
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