document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=830245>Question 830245</A>: <I><SPAN STYLE=\"word-break: break-all;\"> Find all solutions of the equation below on the interval [0,2pi). Enter your answer as a comma-separated list of values or enter none if there is no solution.\r<BR>\n" );
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document.write( "cos theta cos 3 theta - sin theta sin 3 theta = 0 \r<BR>\n" );
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document.write( "Answer: theta =  </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #500699 by </B><A HREF=/tutors/aboutme.mpl?userid=stanbon><B>stanbon(75887)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=stanbon><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=500699\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> Find all solutions of the equation below on the interval [0,2pi). Enter your answer as a comma-separated list of values or enter none if there is no solution. <BR>\n" );
document.write( "cos theta cos 3 theta - sin theta sin 3 theta = 0<BR>\n" );
document.write( "------<BR>\n" );
document.write( "Formula Form: cos(x+y) = cos(x)cos(y) - sin(y)sin(x)<BR>\n" );
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document.write( "Answer: Your problem has that form<BR>\n" );
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document.write( "cos(3t+t) = 0<BR>\n" );
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document.write( "cos(4t) = 0<BR>\n" );
document.write( "----<BR>\n" );
document.write( "Equation:<BR>\n" );
document.write( "4t = pi/2 or (3/2)pi<BR>\n" );
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document.write( "t = pi/8 or t = (3/8)pi<BR>\n" );
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document.write( "Cheers,<BR>\n" );
document.write( "Stan H.<BR>\n" );
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document.write( " </SPAN>\n" );
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