CCL:G: hermiticity of the one electron integral matrix

["Shuwen yao" <lilichemistry{:}yahoo.com>]

 Sent to CCL by: "Shuwen  yao" [lilichemistry**yahoo.com]
 As is well known, the kinetic or potential energy matrix of one electron
 integral on the gaussian output is a symmetric one, which may be rationalized by
 the hermiticity of the operator. But I really can not understand it
 mathematically,say, for any two different functions f1 and f2,i doubt the
 following quation holds always
                  interal of f1*d/d2(f2)=integral of f2*d/d2(f1)
 it will be appreciated very much if you could show me a way out