document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=682759>Question 682759</A>: <I><SPAN STYLE=\"word-break: break-all;\"> Using one of the sum and difference identities, find the exact value of:\r<BR>\n" );
document.write( "\n" );
document.write( "cos(30<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=degrees ALIGN=MIDDLE  ALT=\"degrees\"   DISABLED_style= \"max-width:90%; height:auto;\" >+45<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=degrees ALIGN=MIDDLE  ALT=\"degrees\"   DISABLED_style= \"max-width:90%; height:auto;\" >) </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #423318 by </B><A HREF=/tutors/aboutme.mpl?userid=funmath><B>funmath(2933)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=funmath><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=423318\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=highlight%28cos%28a%2Bb%29=cos%28a%29cos%28b%29-sin%28a%29sin%28b%29%29 ALIGN=MIDDLE  ALT=\"highlight%28cos%28a%2Bb%29=cos%28a%29cos%28b%29-sin%28a%29sin%28b%29%29\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=cos%2830%2B45%29=cos%2830%29cos%2845%29-sin%2830%29sin%2845%29 ALIGN=MIDDLE  ALT=\"cos%2830%2B45%29=cos%2830%29cos%2845%29-sin%2830%29sin%2845%29\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "Use your unit circle or 45,45,90 and 30,60,90 triangles to evaluate:<BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=cos%2830%2B45%29=%28sqrt%283%29%2F2%29%28sqrt%282%29%2F2%29-%281%2F2%29%28sqrt%282%29%2F2%29 ALIGN=MIDDLE  ALT=\"cos%2830%2B45%29=%28sqrt%283%29%2F2%29%28sqrt%282%29%2F2%29-%281%2F2%29%28sqrt%282%29%2F2%29\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "Simplify:<BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=highlight%28cos%2830%2B45%29=%28sqrt%286%29-sqrt%282%29%29%2F4%29 ALIGN=MIDDLE  ALT=\"highlight%28cos%2830%2B45%29=%28sqrt%286%29-sqrt%282%29%29%2F4%29\"   DISABLED_style= \"max-width:90%; height:auto;\" > </SPAN>\n" );
document.write( "</TD></TR></TABLE>\n" );