document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=100848>Question 100848</A>: <I><SPAN STYLE=\"word-break: break-all;\"> Use appropriate identities to find the exact values of the following.<BR>\n" );
document.write( "a.  sec(75degrees)<BR>\n" );
document.write( "    so far I have sec(45deg+30deg)? then stuck.  \r<BR>\n" );
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document.write( "b.  sin(7pi/12)<BR>\n" );
document.write( "    I think this converts down to sin(2pi/3)? then stuck. </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #73425 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=73425\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> Use appropriate identities to find the exact values of the following.<BR>\n" );
document.write( "a.  sec(75degrees)<BR>\n" );
document.write( "    so far I have sec(45deg+30deg)? then stuck.<BR>\n" );
document.write( "= 1/[cos(45+30)]<BR>\n" );
document.write( "= 1/[cos45*cos30-sin45sin30]<BR>\n" );
document.write( "= 1/[1/sqrt2 * sqrt3/2 - 1/sqrt2 *1/2]<BR>\n" );
document.write( "= 1/[sqrt3/2sqrt2 - 1/2sqrt2]<BR>\n" );
document.write( "= 2sqrt2/[sqrt3 - 1]<BR>\n" );
document.write( "= [2sqrt2(sqrt3+1)]/[3-1]<BR>\n" );
document.write( "= [2sqrt6 +2sqrt2]/2<BR>\n" );
document.write( "= sqrt6 + sqrt2<BR>\n" );
document.write( "=========================\r<BR>\n" );
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document.write( "b.  sin(7pi/12)= sin(pi/3 + pi/4)\r<BR>\n" );
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document.write( "= sin(pi/3)cos(pi/4)+cos(pi/3)sin(pi/4)<BR>\n" );
document.write( "= (sqrt3)/2 * (sqrt2)/2 + (1/2)(sqrt2)/2<BR>\n" );
document.write( "= (sqrt6)/4 + (sqrt2)/4<BR>\n" );
document.write( "= [sqrt6 + sqrt2]/4<BR>\n" );
document.write( "===========================<BR>\n" );
document.write( "Cheers,<BR>\n" );
document.write( "Stan H.\r<BR>\n" );
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document.write( "     </SPAN>\n" );
document.write( "</TD></TR></TABLE>\n" );