/* ---------------------------------- */
/* save as fb.h                    */
/* ---------------------------------- */
double f(
double x,
double y)
{
        return( (x*y*y + x*x*y));
}
char  feq[] =  "(x*y**2 + x**2*y)";

/* ---------------------------------- */
/* ---------------------------------- */
double M(
double x,
double y)
{
        return( (y*y+2*x*y));
}
char  Meq[] =  "(y**2 + 2*x*y)";
/* ---------------------------------- */
double N(
double x,
double y)
{
        return(  (x*x+2*x*y));
}
char  Neq[] =  "(x**2 + 2*x*y)";
/* ---------------------------------- */
/* ---------------------------------- */
double g(
double t)
{
        return( (t));
}
char  geq[] =  "t";
/* ---------------------------------- */
double h(
double t)
{
        return( (-1./4.*t+7./4.));
}
char  heq[] =  "-1/4*t + 7/4";
/* ---------------------------------- */
/* ---------------------------------- */