document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=454763>Question 454763</A>: <I><SPAN STYLE=\"word-break: break-all;\"> Please simplify each trigonometric expression:<BR>\n" );
document.write( "1. cos 55º cos 25º + sin 55º sin 25º<BR>\n" );
document.write( "2. sin 70º cos 10º – cos 70º sin 10º  </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #312272 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=312272\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> Please simplify each trigonometric expression:<BR>\n" );
document.write( "1. cos 55º cos 25º + sin 55º sin 25º<BR>\n" );
document.write( "2. sin 70º cos 10º – cos 70º sin 10º<BR>\n" );
document.write( "..<BR>\n" );
document.write( "Use following two identities to solve:<BR>\n" );
document.write( "cos(s-t)=cos s cos t + sin s sin t<BR>\n" );
document.write( "sin(s-t)=sin s cos t - cos s sin t<BR>\n" );
document.write( "..<BR>\n" );
document.write( "1. cos 55 cos 25 + sin 55 sin 25=cos(55-25)=cos(30)=&#8730;3/2<BR>\n" );
document.write( "2. sin 70 cos 10 – cos 7 sin 10º=sin(70-10)=sin(60)=&#8730;3/2 </SPAN>\n" );
document.write( "</TD></TR></TABLE>\n" );