What combination of a mixer’s Local Oscillator (LO) and RF input frequencies is found in the output?

A mixer is a non-linear circuit used in radio receivers and transmitters to shift signals from one frequency to another. When two signals, such as an RF input and a Local Oscillator (LO), are fed into a mixer, the output contains the original frequencies as well as new frequencies. These primary new frequencies are the mathematical sum and the difference of the two input frequencies. This principle, known as heterodyning, is the foundation of the superheterodyne receiver architecture. Distractors like "ratio" or "average" do not reflect the physical frequency mixing process, which always yields additive and subtractive frequency components.