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CRTL, log,log2,log10, Return Values
 *Conan The Librarian 

    x                  The logarithm of the argument (in the
                       appropriate base).
    -HUGE_VAL          x is 0 (errno is set to ERANGE), or x is
                       negative (errno is set to EDOM).
    NaN                x is NaN; errno is set to EDOM.
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