Heiney, Paul A.2023-05-232017-03-062016-07-192017-03-06https://repository.upenn.edu/handle/20.500.14332/49704The use of trigonometric functions in describing electromagnetic waves. Fourier transforms and waves with multiple frequencies present. The Euler formulation of sines and cosines as exponentials. Time 7:35.youtubehttp://creativecommons.org/licenses/by-nc/4.0/Fourier transformsincosineEulerbeatsMathematicsPhysicsArticle