document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=442982>Question 442982</A>: <I><SPAN STYLE=\"word-break: break-all;\"> Prove that the following is an identity:\r<BR>\n" );
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document.write( "1) (4sin^2 x*cos^2 x) = 1 - cos^2 2x  </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #305566 by </B><A HREF=/tutors/aboutme.mpl?userid=lwsshak3><B>lwsshak3(11628)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=lwsshak3><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=305566\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> 1) (4sin^2 x*cos^2 x) = 1 - cos^2 (2x)<BR>\n" );
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document.write( "1) (4sin^2 x*cos^2 x) = 1 - cos^2 (2x)<BR>\n" );
document.write( "start with left side<BR>\n" );
document.write( "2^2*sin^2x*cos^2x<BR>\n" );
document.write( "(2sinxcosx)^2<BR>\n" );
document.write( "sin^2(2x)=1-cos^2(2x)<BR>\n" );
document.write( "confirmed:<BR>\n" );
document.write( "left side = right side </SPAN>\n" );
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