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<div><span class="kw">theorem </span><span class="lab"><font color="Green" title="E25">Th21</font></span>: <a NAME="T21"><span class="comment"><font color="firebrick">:: SIN_COS3:21</font></span><br/></a><div class="add"><a href="sin_cos3.html#K1" title="SIN_COS3:func.1">sin_C</a> <a href="funct_2.html#K10" title="FUNCT_2:func.10">/.</a> <a href="complex1.html#K5" title="COMPLEX1:func.5">0c</a> <a href="hidden.html#R1" title="HIDDEN:pred.1">=</a>  <a href="numbers.html#K5" title="NUMBERS:func.5">0</a> </div></div>
