document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=1036269>Question 1036269</A>: <I><SPAN STYLE=\"word-break: break-all;\"> Simplify the expression by using a double-angle formula. \r<BR>\n" );
document.write( "\n" );
document.write( "cos^2(2pie/5) - sin^2(2pie/5)<BR>\n" );
document.write( " </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #650922 by </B><A HREF=/tutors/aboutme.mpl?userid=Alan3354><B>Alan3354(69443)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=Alan3354><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=Alan3354><BR>You can <A HREF=\"/cgi-bin/embed-solution.mpl?show=1&solution=650922\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> No math problems with pie, unless it's a pie chart.<BR>\n" );
document.write( "Use the Greek letter pi. </SPAN>\n" );
document.write( "</TD></TR></TABLE>\n" );