document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=1075178>Question 1075178</A>: <I><SPAN STYLE=\"word-break: break-all;\"> solve for (0,2pi)\r<BR>\n" );
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document.write( "4cos x+ 4cos^2 x+1=0\r<BR>\n" );
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document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #689869 by </B><A HREF=/tutors/aboutme.mpl?userid=ikleyn><B>ikleyn(52873)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=ikleyn><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=ikleyn><BR>You can <A HREF=\"/cgi-bin/embed-solution.mpl?show=1&solution=689869\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> .<BR>\n" );
document.write( "4cos x+ 4cos^2 x+1=0\r<BR>\n" );
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document.write( "4cos^2 + 4cos + 1 = 0\r<BR>\n" );
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document.write( "(2cos + 1)^2 = 0\r<BR>\n" );
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document.write( "cos(x) = -1/2\r<BR>\n" );
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document.write( "x = 2pi/3, 4pi/3\r<BR>\n" );
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document.write( "The solution by other tutor is incorrect.\r<BR>\n" );
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