document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=865061>Question 865061</A>: <I><SPAN STYLE=\"word-break: break-all;\"> Solve the given equation. (Enter your answers as a comma-separated list. Let k be any integer. Round terms to three decimal places where appropriate. If there is no solution, enter NO SOLUTION.)<BR>\n" );
document.write( "cos (2&#952;) = cos^2 &#952; &#8722; (1/2)<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 #521486 by </B><A HREF=/tutors/aboutme.mpl?userid=stanbon><B>stanbon(75887)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=stanbon><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=521486\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> cos (2&#952;) = cos^2 &#952; &#8722; (1/2)<BR>\n" );
document.write( "-------<BR>\n" );
document.write( "2cos^2(t)-1 = cos^2(t) - (1/2)<BR>\n" );
document.write( "cos^2(t) = 1/2<BR>\n" );
document.write( "-----------------<BR>\n" );
document.write( "cos(t) = +-sqrt(2)/2)<BR>\n" );
document.write( "t = pi/4 or (3/4)pi or (5/4)pi or (7/4)pi<BR>\n" );
document.write( "---------------------------------------------<BR>\n" );
document.write( "Cheers,<BR>\n" );
document.write( "Stan H.\r<BR>\n" );
document.write( "\n" );
document.write( " </SPAN>\n" );
document.write( "</TD></TR></TABLE>\n" );