# FourierCosCoefficient

FourierCosCoefficient[expr,t,n]

gives the n coefficient in the Fourier cosine series expansion of expr.

FourierCosCoefficient[expr,{t1,t2,},{n1,n2,}]

gives a multidimensional Fourier cosine coefficient.

# Details and Options • The  coefficient in the Fourier cosine series expansion of is by default given by .
• The dimensional Fourier cosine coefficient is given by .
• In the form FourierCosCoefficient[expr,t,n], n can be symbolic or a nonnegative integer.
• The following options can be given:
•  Assumptions \$Assumptions assumptions on parameters FourierParameters {1,1} parameters to define Fourier series GenerateConditions False whether to generate results that involve conditions on parameters
• The function expr is assumed to be periodic in t with period , except when otherwise specified by FourierParameters.
• Common settings for FourierParameters include:
•  {1,1} default settings {1,2Pi} period 1 {a,b} general setting

# Examples

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## Basic Examples(2)

Find the 5 Fourier cosine coefficient:

 In:= Out= Find the general term coefficient:

 In:= Out= Plot the sequence:

 In:= Out= Find the {3,5} Fourier cosine coefficient:

 In:= Out= Find the coefficient of the general term:

 In:= Out= Plot the multivariate sequence:

 In:= Out= ## Options(1)

Introduced in 2008
(7.0)