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Can anyone tell me where are the packages for Wolfram Mathematica 11.2 ? How do I load them?

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  • $\begingroup$ The related information can be easily found by searching FourierSeries` in the document. (The document can be opened by pressing F1 key. ) The online edition is here: Compatibility/tutorial/FourierSeries. $\endgroup$
    – xzczd
    Commented Apr 28, 2021 at 4:38

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Mathematica automatically loads much of the functionality of the Wolfram Language on opening, unlike other languages which often only provide base functionality until packages are loaded/imported.

For special packages like the one you mention, they can be loaded in at least two ways:

Needs["FourierSeries`"]

or

<<FourierSeries`

See this page to learn more about loading and using the FourierSeries` package and the functions it includes.

The FourierSeries` package seems to mostly include numerical versions of the Fourier functions that are built-in such as NFourierCosTransform vs. FourierCosTransform. If you prefer the exact versions, you shouldn't need to load the package at all.

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    $\begingroup$ Many (most?) of those functions are now in the Wolfram Function Repository. Possibly they will migrate to Mathematica as System` functions (this is under consideration). $\endgroup$ Commented Apr 28, 2021 at 14:40

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