Hamilton's equations for double pendulum

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Daniel1992
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At the bottom of the following website are the 4 equations that I am using for a double pendulum simulation.

http://scienceworld.wolfram.com/physics/DoublePendulum.html

The equation for C2 has the variables P1 and P2 and I can't work out what they are.:confused:

Is it a typo and they are meant to be Pθ1 and Pθ2?

Any help would be much appreciated.
 
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