document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=920590>Question 920590</A>: <I><SPAN STYLE=\"word-break: break-all;\"> Find all solutions: \r<BR>\n" );
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document.write( "2cos^2 x + cos x = 1\r<BR>\n" );
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document.write( "Please explain<BR>\n" );
document.write( "Thank you </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #558472 by </B><A HREF=/tutors/aboutme.mpl?userid=ewatrrr><B>ewatrrr(24785)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=ewatrrr><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=ewatrrr><BR>You can <A HREF=\"/cgi-bin/embed-solution.mpl?show=1&solution=558472\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> 2cos^2 x + cos x - 1 = 0<BR>\n" );
document.write( "(2cos x -1)(cos x + 1) = 0<BR>\n" );
document.write( "cos x = 1/2, x = &#960;/3 + n(2pi)<BR>\n" );
document.write( "or<BR>\n" );
document.write( "cos x = -1, x = &#960; + n(2pi)<BR>\n" );
document.write( "...........<BR>\n" );
document.write( "(cosx, sinx) Summary Unit Circle<BR>\n" );
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document.write( " </SPAN>\n" );
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