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October 12th, 2010, 02:50 AM   #1
Joined: Oct 2010

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Simple pendulum equation turned into a different form

So I know that the simple pendulum has equation:

I'm basically trying to use Runge Kutta to solve this equation, came across an example from a book where the author has changed the above to numerical form which results:

I've tried use substituting but cannot resolve to the above equation which the book provides.

Any pointers? Thanks
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