document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=535684>Question 535684</A>: <I><SPAN STYLE=\"word-break: break-all;\"> What is the EXACT answer of cot(22.5)? </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #351991 by </B><A HREF=/tutors/aboutme.mpl?userid=lwsshak3><B>lwsshak3(11628)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=lwsshak3><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/images/nopicture.jpg><BR>You can <A HREF=\"/cgi-bin/embed-solution.mpl?show=1&solution=351991\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> What is the EXACT answer of cot(22.5)<BR>\n" );
document.write( "use half angle formula for tan<BR>\n" );
document.write( "tan(22.5º)=tan (45º/2)=(sin 45)/(1+cos(45))<BR>\n" );
document.write( "tan(22.5º)=(&#8730;2/2)/(1+&#8730;2/2)=(&#8730;2/2)/(2+&#8730;2)/2=&#8730;2/(2+&#8730;2)<BR>\n" );
document.write( "cot(22.5º)=1/tan(22.5º)=(2+&#8730;2)/&#8730;2=(2&#8730;2+2)/2=&#8730;2+1<BR>\n" );
document.write( "cot(22.5º)=&#8730;2+1 </SPAN>\n" );
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