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<a NAME="E1:2_1_1"/>
( <font color="Maroon" title="c1">m</font> <a href="xxreal_0.html#R1" title="XXREAL_0:pred.1">&lt;=</a> <font color="Maroon" title="c2">k</font> or <font color="Maroon" title="c1">m</font> <a href="xxreal_0.html#NR4" title="XXREAL_0:NR.4">&gt;</a> <font color="Maroon" title="c2">k</font> )
 
;<br/>
<b>hence </b><a NAME="E2:2_1_1"/>
 <a href="sin_cos.html#K1" title="SIN_COS:func.1">CHK</a> <font color="Maroon" title="c1">m</font>,<font color="Maroon" title="c2">k</font> is <a href="xreal_0.html#V1" title="XREAL_0:attr.1">real</a>
 <b>by </b><i><a class="ref" href="sin_cos.html#D2" target="_self" title="SIN_COS:def.2">Def2</a></i>;<br/>


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