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<div><span class="kw">theorem </span><span class="lab"><font color="Green" title="E72">Th86</font></span>: <a NAME="T86"><span class="comment"><font color="firebrick">:: SIN_COS6:86</font></span><br/></a><div class="add"> <a href="relset_1.html#K1" title="RELSET_1:func.1">dom</a> <a href="sin_cos6.html#K3" title="SIN_COS6:func.3">arccos</a> <a href="hidden.html#R1" title="HIDDEN:pred.1">=</a> <span class="p1"><a href="rcomp_1.html#K1" title="RCOMP_1:func.1">[.</a><span class="default"><span class="p2">(<span class="default"><a href="xcmplx_0.html#K4" title="XCMPLX_0:func.4">-</a> 1</span>)</span>,1</span><a href="rcomp_1.html#K1" title="RCOMP_1:func.1">.]</a></span> <span class="kw">by</span> <span class="lab"><a class="ref" href="comptrig.html#T32" onmouseover="rs('comptrig/T32')" onmouseout="rh()">COMPTRIG:32</a>, <a class="ref" href="funct_1.html#T33" onmouseover="rs('funct_1/T33')" onmouseout="rh()">FUNCT_1:33</a></span>;<br/></div></div>
