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I want to find out description of function

I want to find out description of function ex) sin(), exit() etc

Now I use CCS v4.2.4

When I want to use sin() function, so I used Help Menu \ Help Contents, search.

But I can't find out result of that function.

I want to know How I use that function and description.

I searched *.chm in windows explorer, so found out bios6.chm, ndk.chm, xdais_7_10_00_06.chm, xdctools.chm.

I want like above chm type, but nothing, I want to documents.