User:Glome83

$$ {{{\left( -{E \ n \  {e \sp {\left( i \  a \  w \right)}}} -{E \  n \  {e \sp {\left( -{i \  a \  w} \right)}}} \right)} \ {\sin \left(

\right)}} -{i \ E \  w \  {\cos \left(

\right)} \ {e \sp {\left( i \  a \  w \right)}}}+{i \  E \  w \  {\cos \left(

\right)} \ {e \sp {\left( -{i \  a \  w} \right)}}}} \over {{w \sp 2} -{n \sp 2}} \leqno(38) $$