document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=734502>Question 734502</A>: <I><SPAN STYLE=\"word-break: break-all;\"> Use half-angle identity to find the exact value of tan 22.5 degrees </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #448998 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=448998\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> Use half-angle identity to find the exact value of tan 22.5 degrees<BR>\n" );
document.write( "***<BR>\n" );
document.write( "tan 22.5º=tan(45º/2)=sin 45/(1+cos45)<BR>\n" );
document.write( "=(&#8730;2/2)/(1+&#8730;2/2)<BR>\n" );
document.write( "=&#8730;2/(2+&#8730;2)<BR>\n" );
document.write( "..<BR>\n" );
document.write( "Check with calculator:<BR>\n" );
document.write( "tan 22.5º&#8776;.4142..<BR>\n" );
document.write( "&#8730;2/(2+&#8730;2)&#8776;.4142.. </SPAN>\n" );
document.write( "</TD></TR></TABLE>\n" );