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<div><span class="kw">theorem </span><span class="lab"><font color="Green" title="E43">Th41</font></span>: <a NAME="T41"><span class="comment"><font color="firebrick">:: SIN_COS9:41</font></span><br/></a><div class="add">( <a href="sin_cos.html#K26" title="SIN_COS:func.26">tan</a> <a href="funct_1.html#K1" title="FUNCT_1:func.1">.</a> <a href="numbers.html#K5" title="NUMBERS:func.5">0</a> <a href="hidden.html#R1" title="HIDDEN:pred.1">=</a>  <a href="numbers.html#K5" title="NUMBERS:func.5">0</a>  &amp;  <a href="sin_cos4.html#K1" title="SIN_COS4:func.1">tan</a> <a href="numbers.html#K5" title="NUMBERS:func.5">0</a> <a href="hidden.html#R1" title="HIDDEN:pred.1">=</a>  <a href="numbers.html#K5" title="NUMBERS:func.5">0</a>  )</div></div>
