/* ---------------------------------- */
/* save as fc.h                   */
/* --------------------------------- */
double M(
double x,
double y,
double z)
{
      return( (x*x*x+sin(z)) );
}
char  Meq[] = "+ x^3 + sin(z)";
/* --------------------------------- */
double N(
double x,
double y,
double z)
{
      return( (x*x*y+cos(z)) );
}
char  Neq[] = "+ x^2*y + cos(z)";
/* --------------------------------- */
double P(
double x,
double y,
double z)
{
      return( exp(x*x+y*y) );
}
char  Peq[] = " + exp(x^2 + y^2)";
/* --------------------------------- */
double u(
double x,
double z)
{
 return(      (+0));
}
char  ueq[] = "+0";
/* --------------------------------- */
double v(
double x,
double z)
{
 return(      (5-z) );
}
char  veq[] = "5-z";
/* --------------------------------- */
double s(
double x)
{
 return(       +0 );
}
char  seq[] = "+0";
/* --------------------------------- */
double t(
double x)
{
 return(       4-x*x  );
}
char  teq[] = "4-x^2";
/* --------------------------------- */
/* --------------------------------- */