document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=870963>Question 870963</A>: <I><SPAN STYLE=\"word-break: break-all;\"> Find all solutions in the interval [0,2pi) for the equation cos^2x + 2 cos x= -1 </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #525289 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=525289\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> Find all solutions in the interval [0,2pi) for the equation <BR>\n" );
document.write( "cos^2x + 2 cos x= -1<BR>\n" );
document.write( "cos^2x + 2 cos x + 1=0<BR>\n" );
document.write( "(cos x + 1)(cos x + 1)=0<BR>\n" );
document.write( "cos x = -1<BR>\n" );
document.write( "x = -&#960; (multiplicity 2) </SPAN>\n" );
document.write( "</TD></TR></TABLE>\n" );