document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=434030>Question 434030</A>: <I><SPAN STYLE=\"word-break: break-all;\"> Use an addition or subtraction formula to write the expression as a trigonometric function of one number, and then find its exact value. \r<BR>\n" );
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document.write( "cos(30)cos(60)- sin(30)sin(60) </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #300805 by </B><A HREF=/tutors/aboutme.mpl?userid=robertb><B>robertb(5830)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=robertb><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=robertb><BR>You can <A HREF=\"/cgi-bin/embed-solution.mpl?show=1&solution=300805\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> cos(30)cos(60)- sin(30)sin(60) = cos(30 + 60) = cos(90) = 0 </SPAN>\n" );
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