document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=1170383>Question 1170383</A>: <I><SPAN STYLE=\"word-break: break-all;\"> cos2x-cos4x/sin2x+sin4x=<BR>\n" );
document.write( "a. cot x<BR>\n" );
document.write( "b. tan x<BR>\n" );
document.write( "c. sin x<BR>\n" );
document.write( "d. cos x </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #795268 by </B><A HREF=/tutors/aboutme.mpl?userid=Solver92311><B>Solver92311(821)</B></A><img src=\"/images/stars/stars-11.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=Solver92311><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=Solver92311><BR>You can <A HREF=\"/cgi-bin/embed-solution.mpl?show=1&solution=795268\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> <font face=\"Times New Roman\" size=\"+2\">\r<BR>\n" );
document.write( "<BR>\n" );
document.write( "\n" );
document.write( "You need two identities:\r<BR>\n" );
document.write( "<BR>\n" );
document.write( "\n" );
document.write( "1. <IMG STYLE=\"max-width:80%;\" SRC=\"/cgi-bin/rendertex.cgi?\LARGE \ \ \ \ \ \ \ \ \ \ \cos\alpha\ -\ \cos\beta\ =\ -2\sin\(\frac{\alpha\,-\,\beta}{2}\)\sin\(\frac{\alpha\,+\,\beta}{2}\)\">\r<BR>\n" );
document.write( "<BR>\n" );
document.write( "\n" );
document.write( "2. <IMG STYLE=\"max-width:80%;\" SRC=\"/cgi-bin/rendertex.cgi?\LARGE \ \ \ \ \ \ \ \ \ \ \sin\alpha\ +\ \sin\beta\ =\ 2\sin\(\frac{\alpha\,+\,\beta}{2}\)\cos\(\frac{\alpha\,-\,\beta}{2}\)\">\r<BR>\n" );
document.write( "<BR>\n" );
document.write( "\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=\"/cgi-bin/rendertex.cgi?\LARGE \ \ \ \ \ \ \ \ \ \ \frac{\cos(2x)\,-\,\cos(4x)}{\sin(2x)\,+\,\sin(4x)}\ =\ \frac{-2\sin\(\frac{2x\,-\,4x}{2}\)\sin\(\frac{2x\,+\,4x}{2}\)}{2\sin\(\frac{2x\,+\,4x}{2}\)\cos\(\frac{2x\,-\,4x}{2}\)}\">\r<BR>\n" );
document.write( "<BR>\n" );
document.write( "\n" );
document.write( "You should be able to handle the rest of the simplification on your own.  Hint: <IMG STYLE=\"max-width:80%;\" SRC=\"/cgi-bin/rendertex.cgi?\Large \tan(-x)\ =\ -\tan(x)\">\r<BR>\n" );
document.write( "\n" );
document.write( "																<BR>\n" );
document.write( "John<BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=\"/cgi-bin/rendertex.cgi?\LARGE e^{i\pi}\ +\ 1\ =\ 0\"><BR>\n" );
document.write( "My calculator said it, I believe it, that settles it<BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=\"/cgi-bin/display-illustration.mpl?tutor=Solver92311&illustration_name=darwinfish.jpg\">\r<BR>\n" );
document.write( "\n" );
document.write( "From <https://www.algebra.com/cgi-bin/upload-illustration.mpl> <BR>\n" );
document.write( "I > Ø<BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=\"/cgi-bin/rendertex.cgi?\Large \ \\r\"> </SPAN>\n" );
document.write( "</TD></TR></TABLE>\n" );