document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=1120469>Question 1120469</A>: <I><SPAN STYLE=\"word-break: break-all;\"> using double angle formula <BR>\n" );
document.write( "prove<BR>\n" );
document.write( "a) sin^ 2 2x( cot^2 x-tan^2 x)= 4cos 2x\r<BR>\n" );
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document.write( "very complicated question plz help<BR>\n" );
document.write( "thx lots </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #736144 by </B><A HREF=/tutors/aboutme.mpl?userid=solver91311><B>solver91311(24713)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=solver91311><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=solver91311><BR>You can <A HREF=\"/cgi-bin/embed-solution.mpl?show=1&solution=736144\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> <font face=\"Times New Roman\" size=\"+2\">\r<BR>\n" );
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document.write( "Not complicated at all, actually.\r<BR>\n" );
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document.write( "<IMG STYLE=\"max-width:80%;\" SRC=\"/cgi-bin/rendertex.cgi?\LARGE \ \ \ \ \ \ \ \ \ \ \sin^2(2x)\[\cot^2(x)\ -\ \tan^2(x)\]\">\r<BR>\n" );
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document.write( "Double angle formula for sine:\r<BR>\n" );
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document.write( "<IMG STYLE=\"max-width:80%;\" SRC=\"/cgi-bin/rendertex.cgi?\LARGE \ \ \ \ \ \ \ \ \ \ \(2sin(x)cos(x)\)^2\[\cot^2(x)\ -\ \tan^2(x)\]\">\r<BR>\n" );
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document.write( "tangent is sine over cosine and cotangent is the reciprocal of tangent:\r<BR>\n" );
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document.write( "<IMG STYLE=\"max-width:80%;\" SRC=\"/cgi-bin/rendertex.cgi?\LARGE \ \ \ \ \ \ \ \ \ \ \(2sin(x)cos(x)\)^2\[\frac{\cos^2(x)}{\sin^2(x)}\ -\ \frac{sin^2(x)}{\cos^2(x)}\]\">\r<BR>\n" );
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document.write( "Apply common denominator:\r<BR>\n" );
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document.write( "<IMG STYLE=\"max-width:80%;\" SRC=\"/cgi-bin/rendertex.cgi?\LARGE \ \ \ \ \ \ \ \ \ \ \(2sin(x)cos(x)\)^2\[\frac{\cos^2(x)\ -\ \sin^2(x)}{\sin^2(x)\cos^2(x)}\]\">\r<BR>\n" );
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document.write( "Square the first factor:\r<BR>\n" );
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document.write( "<IMG STYLE=\"max-width:80%;\" SRC=\"/cgi-bin/rendertex.cgi?\LARGE \ \ \ \ \ \ \ \ \ \ \(4sin^2(x)cos^2(x)\)\[\frac{\cos^2(x)\ -\ \sin^2(x)}{\sin^2(x)\cos^2(x)}\]\">\r<BR>\n" );
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document.write( "Eliminate factors common to numerator and denominator:\r<BR>\n" );
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document.write( "<IMG STYLE=\"max-width:80%;\" SRC=\"/cgi-bin/rendertex.cgi?\LARGE \ \ \ \ \ \ \ \ \ \ 4\(\cos^2(x)\ -\ \sin^2(x)\)\">\r<BR>\n" );
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document.write( "Apply double angle identity for cosine:\r<BR>\n" );
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document.write( "<IMG STYLE=\"max-width:80%;\" SRC=\"/cgi-bin/rendertex.cgi?\LARGE \ \ \ \ \ \ \ \ \ \ 4\cos(2x)\">\r<BR>\n" );
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document.write( "Q.E.D.<BR>\n" );
document.write( "								<BR>\n" );
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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" );
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document.write( "<IMG STYLE=\"max-width:80%;\" SRC=\"/cgi-bin/rendertex.cgi?\Large \ \\r\"> </SPAN>\n" );
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