NFourierCosTransform[expr, t, ] gives a numerical approximation to the Fourier cosine transform of expr evaluated at the numerical value , where expr is a function of n.
To use NFourierCosTransform, you first need to load the Fourier Series Package using Needs["FourierSeries`"].
The numerical approximation to the Fourier cosine transform of expr is by default defined to be .
Different choices for the definition of the Fourier cosine transform can be specified using the option FourierParameters.
With the setting FourierParameters->{a, b}, the Fourier cosine transform computed by NFourierCosTransform is .
The parameter b in the setting FourierParameters->{a, b} must be numeric.
In addition to the option FourierParameters, NFourierCosTransform can also accept the options available to NIntegrate. These options are passed directly to NIntegrate.
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EXAMPLES
Basic Examples 
