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In signal processing and related disciplines, aliasing refers to an effect that causes different signals to become indistinguishable (or aliases of one another) when sampled.

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Aliasing beating frequency

Sudarsun is correct. You aren't seeing the additional frequencies because your sample rate is only 1.5Hz. You are limited due to the periodicity of the fourrier transform to a band of .0.75Hz to 0.75 …
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