document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=265830>Question 265830</A>: <I><SPAN STYLE=\"word-break: break-all;\">  Find all solutions of 2cos2 x + 3 cos x + 1 = 0 where x is in radians <BR>\n" );
document.write( "between 0 and 2pi. </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #195392 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=195392\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> Find all solutions of 2cos^2 (x) + 3 cos (x) + 1 = 0 where x is in radians <BR>\n" );
document.write( "between 0 and 2pi.<BR>\n" );
document.write( "---<BR>\n" );
document.write( "Factor:<BR>\n" );
document.write( "(2cos(x) +1)(cos(x) + 1) = 0<BR>\n" );
document.write( "cos(x) = -1/2 or cos(x) = -1<BR>\n" );
document.write( "x = arccos(-1/2) or x = arccos(-1)<BR>\n" );
document.write( "x = (2/3)pi or (4/3)pi  OR x = pi<BR>\n" );
document.write( "=======================================<BR>\n" );
document.write( "Cheers,<BR>\n" );
document.write( "Stan H. </SPAN>\n" );
document.write( "</TD></TR></TABLE>\n" );