document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=691270>Question 691270</A>: <I><SPAN STYLE=\"word-break: break-all;\"> Solve the equation in the interval [0, 2pi.) 2 cos2 &#952; = 2 &#8722; cos 2&#952;\r<BR>\n" );
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document.write( "I think I'm supposed to use either a double or half- angle formula, but I'm not positive.. </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #426613 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=426613\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> Solve the equation in the interval [0, 2pi.) <BR>\n" );
document.write( "2 cos2 &#952; = 2 &#8722; cos 2&#952;<BR>\n" );
document.write( "----<BR>\n" );
document.write( "2cos(2x) = 2 - cos(2x)<BR>\n" );
document.write( "----<BR>\n" );
document.write( "3cos(2x) = 2<BR>\n" );
document.write( "cos(2x) = 2/3<BR>\n" );
document.write( "2x = cos^-1(2/3)<BR>\n" );
document.write( "2x = 0.7859<BR>\n" );
document.write( "x = 0.3929<BR>\n" );
document.write( "=================<BR>\n" );
document.write( "Cheers,<BR>\n" );
document.write( "Stan H.<BR>\n" );
document.write( "================== <BR>\n" );
document.write( " </SPAN>\n" );
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