1.0 link Rainbow Dash Network http://rainbowdash.net/ RDN's Lucifer (nerthos) http://rainbowdash.net/nerthos http://rainbowdash.net/notice/1086147 @<span class="vcard"><a href="http://rainbowdash.net/user/6849" class="url" title="Patrick Farling"><span class="fn nickname">chiefanchor</span></a></span> It seems it was because I used &quot;(Ax+Bx).(Ay+By)&quot; instead of &quot;(Ax.Bx)+(<a href="http://Ay.By/" title="http://Ay.By/" rel="nofollow external">Ay.By</a>)&quot; and now it's 19.6=19.6