document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=890660>Question 890660</A>: <I><SPAN STYLE=\"word-break: break-all;\">  Verify the following identity by using an angle sum identity:<BR>\n" );
document.write( " cos(2x)  = 1 – 2(sin^2x).  Hint (2x = x + x) </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #539130 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=539130\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> Verify the following identity by using an angle sum identity:<BR>\n" );
document.write( " cos(2x) = 1 – 2(sin^2x). Hint (2x = x + x)<BR>\n" );
document.write( "--------------------<BR>\n" );
document.write( "cos(2x) = cos(x+x) = cos^2(x) -sin^2(x) = 1-sin^2(x)-sin^2(x) = 1-2sin^2(x)<BR>\n" );
document.write( "=====================<BR>\n" );
document.write( "Cheers,<BR>\n" );
document.write( "Stan H. </SPAN>\n" );
document.write( "</TD></TR></TABLE>\n" );