an class="comment">/* pi             */</span><span class="preprocessor"></span></div>
<div class="line"><a id="l00567" name="l00567"></a><span class="lineno">  567</span><span class="preprocessor">#define M_PI_2      1.57079632679489661923132169163975144   </span><span class="comment">/* pi/2           */</span><span class="preprocessor"></span></div>
<div class="line"><a id="l00568" name="l00568"></a><span class="lineno">  568</span><span class="preprocessor">#define M_PI_4      0.785398163397448309615660