A simple example where oscillations with two or more frequencies are combined?

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Atlaπtis
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I just need a simple example, preferably one to do with voltage.
thanks for any help :)
 

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Search Internet images for "AM Modulation" and "Beat Frequency"

The AM Modulation set will show you what two ADDED sine waves look like when the frequencies are very different.

The Beat Frequency search will show you what two ADDED sine waves look like in general. Some will show you added sine waves that are nearly the same in frequency.

Addition is not the only way to combine sine waves.
 
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