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Mathc initiation/a367

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fa.h
/* --------------------------------- */
/* save as fa.h                      */
/* --------------------------------- */
double a_n(
int n)
{
        return(( n / (3.*n+2.) ));
}
char  a_neq[] =  "n / (3*n+2)";
/* --------------------------------- */
/* --------------------------------- */
fb.h
/* --------------------------------- */
/* save as fb.h                      */
/* --------------------------------- */
double a_n(
int n)
{
        return((  (2.*n-1.)/(3.*n+2.) ));
}
char  a_neq[] =  "(2.*n-1.)/(3.*n+2.)";
/* --------------------------------- */
/* --------------------------------- */
fc.h
/* --------------------------------- */
/* save as fc.h                      */
/* --------------------------------- */
double a_n(
int n)
{
        return((  pow(1.+1./n,n) ));
}
char  a_neq[] =  "(1.+1./n)^n";
/* --------------------------------- */
/* --------------------------------- */
fd.h
/* --------------------------------- */
/* save as fd.h                      */
/* --------------------------------- */
double a_n(
int n)
{
        return((  pow(1./2.,n) ));
}
char  a_neq[] =     "(1./2.)^n";
/* --------------------------------- */
/* --------------------------------- */