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\[
\exp \left( {\frac{{ - fx\cos \zeta }}
{g}} \right)\left\{ {\begin{array}{*{20}c}
   {(A + Bx + Cxx)\cos \frac{{fx\sin \zeta }}
{g}}  \\
   {(a + bx + cxx)\sin \frac{{fx\sin \zeta }}
{g}}  \\

 \end{array} } \right\}
\]