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Expression for period of pendulum

In the expression for the period of a simple pendulum, we do not take into account the mass that is hanging from the string. How is it possible that the mass does not affect the period of the pendulum? It was stated that the displacement that started the pendulum was small. What would happen if we started the pendulum with an extremely large displacement? The Hint given to me was: What happens when you attempt to swing higher and higher on a swing set?

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