document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=640253>Question 640253</A>: <I><SPAN STYLE=\"word-break: break-all;\"> Prove the identity:\r<BR>\n" );
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document.write( "      2 tan x <BR>\n" );
document.write( "______________ = sin 2x\r<BR>\n" );
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document.write( "  1 + tan^2 x </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #403085 by </B><A HREF=/tutors/aboutme.mpl?userid=Alan3354><B>Alan3354(69443)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=Alan3354><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=Alan3354><BR>You can <A HREF=\"/cgi-bin/embed-solution.mpl?show=1&solution=403085\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> Prove the identity:\r<BR>\n" );
document.write( "\n" );
document.write( "      2 tan x <BR>\n" );
document.write( "______________ = sin 2x\r<BR>\n" );
document.write( "\n" );
document.write( "  1 + tan^2 x<BR>\n" );
document.write( "=======================<BR>\n" );
document.write( "Prove the identity:\r<BR>\n" );
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document.write( "      2 tan x <BR>\n" );
document.write( "______________ = sin 2x\r<BR>\n" );
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document.write( "  sec^2 x<BR>\n" );
document.write( "-----------------<BR>\n" );
document.write( "2tan(x) = sin(2x)*cos^2(x)<BR>\n" );
document.write( "2tan(x) = 2sin(x)cos^3(x)<BR>\n" );
document.write( "Not an identity. </SPAN>\n" );
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