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A pendulum is an object consisting of a mass suspended from a pivot so that it can swing freely. The mathematics of pendulums are governed by the differential equation which is a nonlinear equation in θ.{\displaystyle \theta .} Here, g≈9.8 ms−2{\displaystyle g\approx 9.8\ {\text{m}}\,{\text{s}}^{-2}} is the gravitational acceleration, and l{\displaystyle l} is the length of the
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