As of Version 7.0, FourierCoefficient is part of the built-in Mathematica kernel.
As of Version 7.0, FourierCosCoefficient is part of the built-in Mathematica kernel.
As of Version 7.0, FourierSeries is part of the built-in Mathematica kernel.
As of Version 7.0, FourierSinCoefficient is part of the built-in Mathematica kernel.
As of Version 7.0, FourierTrigSeries is part of the built-in Mathematica kernel.
As of Version 7.0, InverseDTFourierTransform has been renamed to InverseFourierSequenceTransform and is part of the built-in Mathematica kernel.
As of Version 6.0, NIntegrate natively supports InterpolatingFunction objects.
As of Version 7.0, Eccentricity has become a property of GeodesyData.
As of Version 7.0, GeodeticToAuthalic has been renamed to "FromAuthalicLatitude" and has become a property of GeodesyData.