view excel vba code for built in functions

A

aces4

Anyone know how to view the code for the fuction Trim() or Trim$()?
Specifically in Excel. It's not removing the &nbsp from html pages I
copy forom, soI had to write my own code as a work around. So, I want
to see the existing Trim() & Trim$() code to see if it is including
the &nbsp in it's search for whitespace.
 
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