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<div><span class="kw">theorem </span><span class="lab"><font color="Green" title="E31">Th28</font></span>: <a NAME="T28"><span class="comment"><font color="firebrick">:: INTEGRA8:28</font></span><br/></a><div class="add"><a href="sin_cos.html#K18" title="SIN_COS:func.18">cos</a> <a href="fdiff_1.html#K2" title="FDIFF_1:func.2">`|</a> <a href="numbers.html#K1" title="NUMBERS:func.1">REAL</a> <a href="hidden.html#R1" title="HIDDEN:pred.1">=</a>  <a href="valued_1.html#K32" title="VALUED_1:func.32">-</a> <a href="sin_cos.html#K16" title="SIN_COS:func.16">sin</a></div></div>
