document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=546763>Question 546763</A>: <I><SPAN STYLE=\"word-break: break-all;\"> How do I use the difference identity to find an exact value for cos(-15).  I was able to get the answer of sqrt(6)- sqrt(2) all over 4.  But, the correct answer did not subtract the sqrt(2), it added it. I'm not sure what I did wrong! Please help me! Thanks! </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #356086 by </B><A HREF=/tutors/aboutme.mpl?userid=stanbon><B>stanbon(75887)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=stanbon><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=356086\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> How do I use the difference identity to find an exact value for <BR>\n" );
document.write( "cos(-15) = -0.7597<BR>\n" );
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document.write( "Cheers,<BR>\n" );
document.write( "Stan H.<BR>\n" );
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