document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=644080>Question 644080</A>: <I><SPAN STYLE=\"word-break: break-all;\"> Which expression is equivalent to cos 2 theta for all values of theta:\r<BR>\n" );
document.write( "\n" );
document.write( "cos squared theta minus sin squared theta\r<BR>\n" );
document.write( "\n" );
document.write( "1 - sin squared theta\r<BR>\n" );
document.write( "\n" );
document.write( "cos squared theta minus 1\r<BR>\n" );
document.write( "\n" );
document.write( "(2) (sin theta) (cos theta) </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #404854 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=404854\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> Which expression is equivalent to cos 2 theta for all values of theta: <BR>\n" );
document.write( "cos squared theta minus sin squared theta <BR>\n" );
document.write( "1 - sin squared theta <BR>\n" );
document.write( "cos squared theta minus 1 <BR>\n" );
document.write( "(2) (sin theta) (cos theta)<BR>\n" );
document.write( "**<BR>\n" );
document.write( "cos2 theta=cos squared theta minus sin squared theta<BR>\n" );
document.write( "cos2x=cos^2x-sin^2x<BR>\n" );
document.write( "note: you can find this identity in any trigonometry textbook. </SPAN>\n" );
document.write( "</TD></TR></TABLE>\n" );