document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=1203823>Question 1203823</A>: <I><SPAN STYLE=\"word-break: break-all;\"> Find all exact solutions on [0, 2𝜋).  (Enter your answers as a comma-separated list.)<BR>\n" );
document.write( "2 cos^2(t) − cos(t) = 1<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 #839671 by </B><A HREF=/tutors/aboutme.mpl?userid=mananth><B>mananth(16946)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=mananth><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=mananth><BR>You can <A HREF=\"/cgi-bin/embed-solution.mpl?show=1&solution=839671\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> <BR>\n" );
document.write( "2 cos^2(t) − cos(t) = 1\r<BR>\n" );
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document.write( "2 cos^2(t) − cos(t) - 1=0\r<BR>\n" );
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document.write( "2cos^2t-2cost+cost-1=0\r<BR>\n" );
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document.write( "2cost(cost -1)+1(cost-1)=0\r<BR>\n" );
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document.write( "(2cost+1)(cost-1)=0\r<BR>\n" );
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document.write( "If 2cost +1=0 <BR>\n" );
document.write( "2cost = -1<BR>\n" );
document.write( "cost =-1/2\r<BR>\n" );
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document.write( "cost-1 = 0\r<BR>\n" );
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document.write( "cost =1\r<BR>\n" );
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document.write( "From above <BR>\n" );
document.write( "This is true when \r<BR>\n" );
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document.write( "t =0,2pi/3,4pi/3\r<BR>\n" );
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document.write( " </SPAN>\n" );
document.write( "</TD></TR></TABLE>\n" );