document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=1114641>Question 1114641</A>: <I><SPAN STYLE=\"word-break: break-all;\"> Find all solutions of the equation in the interval [0, 2&#960;). (Enter your answers as a comma-separated list. If there is no solution, enter NO SOLUTION.)<BR>\n" );
document.write( "2cos^2x+cosx&#8722;1=0 </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #729560 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=729560\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> 2cos^2x+cosx&#8722;1=0<BR>\n" );
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document.write( "Factor:<BR>\n" );
document.write( "(2cos(x)-1)(cos(x)+1) = 0<BR>\n" );
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document.write( "cos(x) = 1/2 or cos(x) = -1<BR>\n" );
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document.write( "x = arccos(1/2) = +/-60 degrees or 180 degrees<BR>\n" );
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document.write( "Cheers,<BR>\n" );
document.write( "Stan H.<BR>\n" );
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