document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=149423>Question 149423</A>: <I><SPAN STYLE=\"word-break: break-all;\"> Find the exact value of: <BR>\n" );
document.write( "sin 70degrees cos 40degrees - cos 70degrees sin 40degrees. </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #109624 by </B><A HREF=/tutors/aboutme.mpl?userid=jim_thompson5910><B>jim_thompson5910(35256)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=jim_thompson5910><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=109624\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=sin%2870%29%2Acos%2840%29+-+cos%2870%29%2Asin%2840%29 ALIGN=MIDDLE  ALT=\"sin%2870%29%2Acos%2840%29+-+cos%2870%29%2Asin%2840%29\"   DISABLED_style= \"max-width:90%; height:auto;\" > Start with the given expression.\r<BR>\n" );
document.write( "<BR>\n" );
document.write( "<BR>\n" );
document.write( "\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=sin%2870-40%29 ALIGN=MIDDLE  ALT=\"sin%2870-40%29\"   DISABLED_style= \"max-width:90%; height:auto;\" > Rewrite the expression using the identity <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=sin%28x%29%2Acos%28y%29+-+cos%28x%29%2Asin%28y%29=sin%28x-y%29 ALIGN=MIDDLE  ALT=\"sin%28x%29%2Acos%28y%29+-+cos%28x%29%2Asin%28y%29=sin%28x-y%29\"   DISABLED_style= \"max-width:90%; height:auto;\" >\r<BR>\n" );
document.write( "<BR>\n" );
document.write( "<BR>\n" );
document.write( "\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=sin%2830%29 ALIGN=MIDDLE  ALT=\"sin%2830%29\"   DISABLED_style= \"max-width:90%; height:auto;\" > Subtract\r<BR>\n" );
document.write( "<BR>\n" );
document.write( "<BR>\n" );
document.write( "\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=1%2F2 ALIGN=MIDDLE  ALT=\"1%2F2\"   DISABLED_style= \"max-width:90%; height:auto;\" > Take the sine of 30 to get 1/2\r<BR>\n" );
document.write( "<BR>\n" );
document.write( "<BR>\n" );
document.write( "\n" );
document.write( "So <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=sin%2870%29%2Acos%2840%29+-+cos%2870%29%2Asin%2840%29=1%2F2 ALIGN=MIDDLE  ALT=\"sin%2870%29%2Acos%2840%29+-+cos%2870%29%2Asin%2840%29=1%2F2\"   DISABLED_style= \"max-width:90%; height:auto;\" > </SPAN>\n" );
document.write( "</TD></TR></TABLE>\n" );