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Help with IQ Math Library

Can someone please help me understand the IQ Math library? I was going through a source code which had some calculations with IQ 21 / IQ 15. Im new to C2000 family. I would appreciate if someone can give me an overview of the library and what it is used for.

I did go through the datasheet. If someone could give more clarification on the same , I would appreciate it. Thanks

-Binesh