Stick your arm straight out in front of you. Then move your arm anti-clockwise at – as near as possible – a smooth fixed speed. Find out the time for which your arm was exactly at a point P.
As delta x (the very small value for which your arm was at that particular point P) tends to zero, then the frequency density calculations with points P1, P2, P3, etc. will tend towards 1/0. Of course, nothing can ever be divided by 0, so therefore your arm never really moved at all…
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