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<div><span class="kw">theorem </span><span class="lab"><font color="Green" title="E45">Th58</font></span>: <a NAME="T60"><span class="comment"><font color="firebrick">:: COMPLEX2:60</font></span><br/></a><div class="add"> for <font color="Olive" title="b1">a</font> being   <a href="xcmplx_0.html#NM1" title="XCMPLX_0:NM.1">Complex</a> holds   <a href="complex2.html#K2" title="COMPLEX2:func.2">Rotate</a> (<font color="Olive" title="b1">a</font>,<a href="sin_cos.html#K28" title="SIN_COS:func.28">PI</a>) <a href="hidden.html#R1" title="HIDDEN:pred.1">=</a>  <a href="xcmplx_0.html#K4" title="XCMPLX_0:func.4">-</a> <font color="Olive" title="b1">a</font></div></div>
