document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=675196>Question 675196</A>: <I><SPAN STYLE=\"word-break: break-all;\"> I need help simplifying the given expression\r<BR>\n" );
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document.write( "cos(5)cos(4) + sin(5)sin(4) </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #419618 by </B><A HREF=/tutors/aboutme.mpl?userid=jsmallt9><B>jsmallt9(3758)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=jsmallt9><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=419618\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> cos(5)cos(4) + sin(5)sin(4)<br><BR>\n" );
document.write( "cos(A-B) = cos(A)cos(B) + sin(A)sin(B)<BR>\n" );
document.write( "Your expression matches the pattern of the right side of cos(A-B), with the \"A\" being 5 and the \"B\" being 4. So, according to the formula, your expression must be equal to the left side (with the \"A\" being 5 and the \"B\" being 4):<BR>\n" );
document.write( "cos(5-4)<BR>\n" );
document.write( "which simplifies to:<BR>\n" );
document.write( "cos(1) </SPAN>\n" );
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