Derive abbreviation of cos(a+summation(b))

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SUMMARY

The discussion focuses on deriving the abbreviation of the equation cos(a + summation(b)). The user seeks to extend cos(summation) and sin(summation) into the forms of Bessel functions or products of Sin(wmt + phim). The initial step recommended is utilizing the identity cos(x) = Re(e^(ix)) to facilitate the derivation process.

PREREQUISITES
  • Understanding of trigonometric identities, specifically Euler's formula.
  • Familiarity with Bessel functions and their properties.
  • Knowledge of complex numbers and their representation.
  • Basic calculus concepts related to summation and series.
NEXT STEPS
  • Study the derivation of Bessel functions from trigonometric identities.
  • Learn about the application of Euler's formula in complex analysis.
  • Research the properties of summation in relation to Fourier series.
  • Explore the relationship between trigonometric functions and complex exponentials.
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Students in advanced mathematics, physicists working with wave functions, and anyone involved in signal processing or harmonic analysis.

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Homework Statement


I want to derive these equations
5958575700_1469177061.png


Homework Equations

The Attempt at a Solution



2388261400_1469177061.jpg

But I don't have any idea how can extend cos(summation) and sin(summation) in form of Bessel function or product of Sin(wmt+phim)
 
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The first step is using cos(x) = Re(eix)
 
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