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FM Radio Modulation
v(t) = cos(ω_c t + β·sin ω_m t)

Frequency modulation encodes the audio in how fast the carrier wiggles — constant amplitude makes FM immune to the static that plagues AM.
Computed & rendered in pure C# on the frozen OnlyCSharp 1.8 library — animation baked to GIF with the library's own
Gif encoder (no GPU, no ffmpeg, no external packages).