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Simulate double pendulum motion in the gravitational field. The pendulum consists of two lengths of l1 and l2 of the rigid rod constituted of masses m1 and m2, the connection between two friction hinge, the pendulum mass M. May study (full analysis of each part is not required to clear): 1. Similarly different initial positions rod length pendulum 2. Rod length changes pendulum 3. Alter the quality of the pendulum and rod pendulum movement of four. consider the impact of air damping