document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=631664>Question 631664</A>: <I><SPAN STYLE=\"word-break: break-all;\"> solve the equation over interval [0,360) <BR>\n" );
document.write( "(2 cos squared theta ) + (2 cos theta) - 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 #400235 by </B><A HREF=/tutors/aboutme.mpl?userid=lwsshak3><B>lwsshak3(11628)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=lwsshak3><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=400235\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> solve the equation over interval [0,360) <BR>\n" );
document.write( "(2 cos squared theta ) + (2 cos theta) - 1 = 0<BR>\n" );
document.write( "**<BR>\n" );
document.write( "2cos^2x+2cosx-1=0<BR>\n" );
document.write( "(2cosx-1)(cosx+1)=0<BR>\n" );
document.write( "2cosx-1=0<BR>\n" );
document.write( "cosx=1/2<BR>\n" );
document.write( "x=60º and 300º (in quadrants I and IV where cos>0)<BR>\n" );
document.write( "or<BR>\n" );
document.write( "cosx-1=0<BR>\n" );
document.write( "cosx=1<BR>\n" );
document.write( "x=0 </SPAN>\n" );
document.write( "</TD></TR></TABLE>\n" );