 added in a further revision upon request. It should be noted that it is
      these functions which force the dependency upon the <a href="../../../../../boost/math/special_functions/sinc.hpp" target="_top">boost/math/special_functions/sinc.hpp</a>
      and the <a href="../../../../../boost/math/special_functions/sinhc.hpp" target="_top">boost/math/special_functions/sinhc.hpp</a>
      headers.
    </p>
<h5>
<a name="math_toolkit.oct_trans.h0"></a>
      <span class="phrase"><a name="math_toolkit.oct_tran