document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=754380>Question 754380</A>: <I><SPAN STYLE=\"word-break: break-all;\"> If A is in Quadrant III and <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=cot%28a%29=2 ALIGN=MIDDLE  ALT=\"cot%28a%29=2\"   DISABLED_style= \"max-width:90%; height:auto;\" > , find the value of <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=cos2a ALIGN=MIDDLE  ALT=\"cos2a\"   DISABLED_style= \"max-width:90%; height:auto;\" > </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #459049 by </B><A HREF=/tutors/aboutme.mpl?userid=tommyt3rd><B>tommyt3rd(5050)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=tommyt3rd><IMG SRC=http://www.algebra.com/images/aboutme-small.gif BORDER=0 alt=\"About Me\" VALIGN=MIDDLE></A>&nbsp;<IMG SRC=http://www.algebra.com/cgi-bin/show-face.mpl?user=tommyt3rd><BR>You can <A HREF=\"/cgi-bin/embed-solution.mpl?show=1&solution=459049\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=cot%28a%29=x%2Fy=2%2F1 ALIGN=MIDDLE  ALT=\"cot%28a%29=x%2Fy=2%2F1\"   DISABLED_style= \"max-width:90%; height:auto;\" >\r<BR>\n" );
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document.write( "so that<BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=r=sqrt%281%5E2%2B2%5E2%29=sqrt%285%29 ALIGN=MIDDLE  ALT=\"r=sqrt%281%5E2%2B2%5E2%29=sqrt%285%29\"   DISABLED_style= \"max-width:90%; height:auto;\" >\r<BR>\n" );
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document.write( "and so \r<BR>\n" );
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document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=cos%282a%29=2cos%5E2%28a%29-1=2%28x%2Fr%29%5E2-1=2%282%2Fsqrt%285%29%29%5E2-1=3%2F5 ALIGN=MIDDLE  ALT=\"cos%282a%29=2cos%5E2%28a%29-1=2%28x%2Fr%29%5E2-1=2%282%2Fsqrt%285%29%29%5E2-1=3%2F5\"   DISABLED_style= \"max-width:90%; height:auto;\" > </SPAN>\n" );
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