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## Homework Statement

Write the lagrangian equations for:

A simple pendulum whose suspension point oscillates horizontally in its plan according to the law

x = a.cos(ωt)

My problem is trying to know which are the generalized coordinates.

i considered :

x (θ) = a.cos(ωt) + l.sinθ

y (θ) = l.cos θ

Is that correct?

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