document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=752009>Question 752009</A>: <I><SPAN STYLE=\"word-break: break-all;\"> given sin theta= -root 7/4 and theta is in quadrant IV, find the exact value of cos theta/2 </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #457532 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=457532\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> given sin theta= -root 7/4 and theta is in quadrant IV, find the exact value of cos theta/2<BR>\n" );
document.write( "***<BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=cos%28x%2F2%29=sqrt%28%281%2Bcos%28x%29%29%2F2%29 ALIGN=MIDDLE  ALT=\"cos%28x%2F2%29=sqrt%28%281%2Bcos%28x%29%29%2F2%29\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=sin%28x%29=-sqrt%287%29%2F4 ALIGN=MIDDLE  ALT=\"sin%28x%29=-sqrt%287%29%2F4\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=cos%28x%29=sqrt%281-sin%5E2%28x%29%29=sqrt%281-7%2F16%29=sqrt%289%2F16%29=3%2F4 ALIGN=MIDDLE  ALT=\"cos%28x%29=sqrt%281-sin%5E2%28x%29%29=sqrt%281-7%2F16%29=sqrt%289%2F16%29=3%2F4\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=cos%28x%2F2%29=-sqrt%28%281%2Bcos%28x%29%29%2F2%29=-sqrt%28%281%2B3%2F4%29%2F2%29=-sqrt%287%2F4%29%2F2%29=-sqrt%287%2F8%29 ALIGN=MIDDLE   DISABLED_style= \"max-width:90%; height:auto;\" > ( in Q3 where cos<0)<BR>\n" );
document.write( "..<BR>\n" );
document.write( "Check with calculator:<BR>\n" );
document.write( "sinx=-&#8730;7/4 (in Q4)<BR>\n" );
document.write( "x=318.49º<BR>\n" );
document.write( "x/2=159.30º (in Q3)<BR>\n" );
document.write( "cos(x/2)=cos(159.30º)&#8776;-0.9354..<BR>\n" );
document.write( "Exact value=-&#8730;(7/8)&#8776;-0.9354.. </SPAN>\n" );
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