# A Real Sinusoid: The DNA of Signals

Explore how a real sinusoid comes from two complex sinusoids and forms the basis for the spectrum of any signal.

## We'll cover the following

A complex sinusoid rotating with time in the $IQ$ plane generates two real sinusoids. The question now is to produce only one real sinusoid in the complex $IQ$ plane. We start with the math and then code the expressions for visualization.

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