document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=1172168>Question 1172168</A>: <I><SPAN STYLE=\"word-break: break-all;\"> Find the exact value of the trigonometric expression when sin(u) = − 5/13 and <BR>\n" );
document.write( "cos(v) = − 4/5. (Both u and v are in Quadrant III.)<BR>\n" );
document.write( "                      cos(u + v) </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #797098 by </B><A HREF=/tutors/aboutme.mpl?userid=Alan3354><B>Alan3354(69443)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=Alan3354><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=Alan3354><BR>You can <A HREF=\"/cgi-bin/embed-solution.mpl?show=1&solution=797098\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> Half angle formulas on Wikipedia covers this very well.<BR>\n" );
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document.write( "What is the point of having someone do them for you?<BR>\n" );
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document.write( "PS  There are a LOT of formulas.  I remember some of them, but not all.<BR>\n" );
document.write( "There's no good reason to try to memorize all of them, and I doubt that anyone can.<BR>\n" );
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