document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=39250>Question 39250</A>: <I><SPAN STYLE=\"word-break: break-all;\"> I have problem with this question:<BR>\n" );
document.write( "     Find the value of sin4A  </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #24676 by </B><A HREF=/tutors/aboutme.mpl?userid=fractalier><B>fractalier(6550)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=fractalier><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=fractalier><BR>You can <A HREF=\"/cgi-bin/embed-solution.mpl?show=1&solution=24676\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> sin 4a = sin 2(2a) = <BR>\n" );
document.write( "2 sin 2a cos 2a =<BR>\n" );
document.write( "2 * (2 sin a cos a) * (cos^2 a - sin^2 a) =<BR>\n" );
document.write( "4 sin a cos^3 a - 4 sin^3 a cos a </SPAN>\n" );
document.write( "</TD></TR></TABLE>\n" );