document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=587878>Question 587878</A>: <I><SPAN STYLE=\"word-break: break-all;\"> cos^2x-sin^2x=2cos^2x-1  verify the identity </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #374272 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=374272\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> cos^2x-sin^2x=2cos^2x-1 verify the identity<BR>\n" );
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document.write( "Since sin^2 = 1-cos^2,<BR>\n" );
document.write( "substitute to get:<BR>\n" );
document.write( "cos^2 - (1-cos^2)<BR>\n" );
document.write( "= 2cos^2-1<BR>\n" );
document.write( "=================<BR>\n" );
document.write( "Cheers,<BR>\n" );
document.write( "Stan H. </SPAN>\n" );
document.write( "</TD></TR></TABLE>\n" );