c++ - Namespace + functions versus static methods on a class

Let's say I have, or am going to write, a set of related
functions. Let's say they're math-related. Organizationally, should
I:

1. Write these functions
   and put them in my MyMath namespace and refer to them via
   MyMath::XYZ()


2. Create a class
   called MyMath and make these methods static and refer to the
   similarly
   MyMath::XYZ()

Why
would I choose one over the other as a means of organizing my
software?