document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=852378>Question 852378</A>: <I><SPAN STYLE=\"word-break: break-all;\"> If sin x<0 and tan x=-4/5, find the exact value of sec x<BR>\n" );
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document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #513336 by </B><A HREF=/tutors/aboutme.mpl?userid=lwsshak3><B>lwsshak3(11628)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=lwsshak3><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=513336\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> If sin x<0 and tan x=-4/5, find the exact value of sec x<BR>\n" );
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document.write( "reference angle in Q4 in which sin<0, cos>0, tan<0<BR>\n" );
document.write( "Identity: <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=sec%28x%29=sqrt%281%2Btan%5E2%28x%29%29=sqrt%281%2B%2816%2F25%29%29=sqrt%2841%2F25%29=sqrt%2841%29%2F5 ALIGN=MIDDLE   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "...<BR>\n" );
document.write( "calculator check:<BR>\n" );
document.write( "tanx=-4/5 (in Q4)<BR>\n" );
document.write( "x&#8776;321.34&#730;<BR>\n" );
document.write( "secx=1/cosx=1/cos(321.34)&#8776;1.2806…<BR>\n" );
document.write( "Exact value=&#8730;41/5&#8776;1.2806… </SPAN>\n" );
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