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/usr/share/doc/rheolef-doc/examples/cosinusprod_laplace.icc is in rheolef-doc 6.7-6.

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struct f {
  Float operator() (const point& x) const { 
    return d*pi*pi*cos(pi*x[0])*cos(pi*x[1])*cos(pi*x[2]); }
  f(size_t d1) : d(d1), pi(acos(Float(-1))) {}
  size_t d; const Float pi;
};
struct g {
  Float operator() (const point& x) const { 
    return cos(pi*x[0])*cos(pi*x[1])*cos(pi*x[2]); }
  g(size_t d1) : pi(acos(Float(-1))) {}
  const Float pi;
};