document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=100849>Question 100849</A>: <I><SPAN STYLE=\"word-break: break-all;\"> Suppose that sec(2t)=(-13/12), and that pi/2<t<0.<BR>\n" );
document.write( "Find the exact value of cos(t) </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #73423 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=73423\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> Suppose that sec(2t)=(-13/12), and that pi/2<t<0.<BR>\n" );
document.write( "Find the exact value of cos(t)<BR>\n" );
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document.write( "sec(2t)=(-13/12)<BR>\n" );
document.write( "cos(2t)=(-12/13)<BR>\n" );
document.write( "2t = cos^-1(-12/13) = 157.38 degrees<BR>\n" );
document.write( "t = 78.69 degrees<BR>\n" );
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document.write( "Cheers,<BR>\n" );
document.write( "Stan H.\r<BR>\n" );
document.write( "\n" );
document.write( " </SPAN>\n" );
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