document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=663634>Question 663634</A>: <I><SPAN STYLE=\"word-break: break-all;\"> Use a double-angle formula to simplify the equation<BR>\n" );
document.write( "sin(2x)+cos(x)=0,and then find all solutions of the equation that lie in the interval [0,2\pi).\r<BR>\n" );
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document.write( "If there is more than one solution, enter the solutions in a list separated by commas. If necessary, enter pi as pi. </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #412865 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=412865\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> Use a double-angle formula to simplify the equation<BR>\n" );
document.write( "sin(2x)+cos(x)=0,and then find all solutions of the equation that lie in the interval [0,2\pi). <BR>\n" );
document.write( "If there is more than one solution, enter the solutions in a list separated by commas.<BR>\n" );
document.write( "**<BR>\n" );
document.write( "sin2x+cosx=0<BR>\n" );
document.write( "2sinxcosx+cosx=0<BR>\n" );
document.write( "cosx(2sinx+1)=0<BR>\n" );
document.write( "cosx=0<BR>\n" );
document.write( "x=&#960;/2, 3&#960;/2<BR>\n" );
document.write( "..<BR>\n" );
document.write( "2sinx+1=0<BR>\n" );
document.write( "sinx=-1/2<BR>\n" );
document.write( "x=7&#960;/6, 11&#960;/6<BR>\n" );
document.write( "..<BR>\n" );
document.write( "solutions:x=&#960;/2, 3&#960;/2, 7&#960;/6, 11&#960;/6 </SPAN>\n" );
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