> 
> You can have a few more points if you explain the "in the limit of small
> elongations" part...

That makes me suspicious, where do you get the points from, so you can 
shell them out like no good? ;)

Try to set up the differential equations for the pendulum, and you'll run 
into non-linear parts somewhere. So in order to keep the solution simple, 
usually one assumes elongations small compared to the pendulum length (so 
that you can approximate "sin(x)" by a much more linear "x").

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