document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=594726>Question 594726</A>: <I><SPAN STYLE=\"word-break: break-all;\"> find the exact value of cos 195 degrees + cos 105 degrees </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #376947 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=376947\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> find the exact value of cos 195 degrees + cos 105 degrees<BR>\n" );
document.write( "**<BR>\n" );
document.write( "Sum to product formula:<BR>\n" );
document.write( "cos s + cos t=2cos(s+t)/2*cos(s-t)/2<BR>\n" );
document.write( "..<BR>\n" );
document.write( "cos 195+cos 105=2cos(195+105)/2*(cos)195-95)/2<BR>\n" );
document.write( "=2cos(300/2)*cos(90/2)<BR>\n" );
document.write( "=2cos(150)*cos(45)<BR>\n" );
document.write( "=2*-&#8730;3/2*&#8730;2/2<BR>\n" );
document.write( "=-&#8730;6/2 &#8776;-1.224 </SPAN>\n" );
document.write( "</TD></TR></TABLE>\n" );