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<div>:: <span class="kw">deftheorem </span>   defines <a href="sin_cos5.html#K2" title="SIN_COS5:func.2">sech</a> <a onclick="hs(this)" href="javascript:()">SIN_COS5:def 2 : <br/></a><span> for <font color="Olive" title="b1">x</font> being   <a href="xreal_0.html#NM1" title="XREAL_0:NM.1">Real</a> holds   <a href="sin_cos5.html#K2" title="SIN_COS5:func.2">sech</a> <font color="Olive" title="b1">x</font> <a href="hidden.html#R1" title="HIDDEN:pred.1">=</a> 1 <a href="xcmplx_0.html#K7" title="XCMPLX_0:func.7">/</a> <span class="p1">(<span class="default"><a href="sin_cos2.html#K4" title="SIN_COS2:func.4">cosh</a> <font color="Olive" title="b1">x</font></span>)</span>;<br/></span></div>
