public static MathObject ExpandProduct(this MathObject r, MathObject s)
{
if (r is Sum)
{
var f = (r as Sum).elts[0];
return f.ExpandProduct(s) + (r - f).ExpandProduct(s);
}
if (s is Sum) return s.ExpandProduct(r);
return r * s;
}
public static MathObject ExpandProduct(this MathObject r, MathObject s)
{
if (r is Sum)
{
var f = (r as Sum).elts[0];
return f.ExpandProduct(s) + (r - f).ExpandProduct(s);
}
if (s is Sum) return s.ExpandProduct(r);
return r * s;
}
public static MathObject ExpandProduct(this MathObject r, MathObject s)
{
while (true)
{
if (r is Sum)
{
MathObject f = ((Sum)r).elts[0];
return(f.ExpandProduct(s) + (r - f).ExpandProduct(s));
}
if (s is Sum)
{
var r1 = r;
r = s;
s = r1;
continue;
}
return(r * s);
}
}