Converts sum of sines into a product. Essential for solving equations and analyzing wave interference.
Wave beats — Two slightly different frequencies create audible beats.
Radio tuning — Combining signals in radio receivers.
Music — Piano tuning using beat frequencies.
Acoustics — Sound wave interference in concert halls.
Electronics — Signal mixing in communication systems.
Optics — Light interference in thin films.
Sonar — Underwater sound wave combination.
Medical imaging — Ultrasound signal processing.
Seismology — Combining seismic wave data.
Telecommunications — Frequency multiplexing.
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