document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=975681>Question 975681</A>: <I><SPAN STYLE=\"word-break: break-all;\"> Use the given information to evaluate each expression. (Enter your answers in exact form.)<BR>\n" );
document.write( "cos &#946; = &#8722;2/7 with 180° < &#946; < 270°<BR>\n" );
document.write( "(a) sin(&#946;/2) = \r<BR>\n" );
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document.write( "(b) cos(&#946;/2) = \r<BR>\n" );
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document.write( "(c) tan(&#946;/2) = \r<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 #597393 by </B><A HREF=/tutors/aboutme.mpl?userid=ikleyn><B>ikleyn(52797)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=ikleyn><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/cgi-bin/show-face.mpl?user=ikleyn><BR>You can <A HREF=\"/cgi-bin/embed-solution.mpl?show=1&solution=597393\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> \r<BR>\n" );
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document.write( "Use the formulas for trigonometric functions of half argument &nbsp;(see, &nbsp;for example, &nbsp;the lesson &nbsp;<A  rel=nofollow HREF=http://www.algebra.com/algebra/homework/Trigonometry-basics/Compendium-of-Trigonometry-Formulas.lesson>FORMULAS FOR TRIGONOMETRIC FUNCTIONS</A>&nbsp; in this site)\r<BR>\n" );
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document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=sin%28beta%2F2%29 ALIGN=MIDDLE  ALT=\"sin%28beta%2F2%29\"   DISABLED_style= \"max-width:90%; height:auto;\" > = <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=sqrt%28%281-cos%5E2%28beta%29%29%2F2%29 ALIGN=MIDDLE  ALT=\"sqrt%28%281-cos%5E2%28beta%29%29%2F2%29\"   DISABLED_style= \"max-width:90%; height:auto;\" > = <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=sqrt%28%281-%28%28-2%29%2F7%29%5E2%29%2F2%29 ALIGN=MIDDLE  ALT=\"sqrt%28%281-%28%28-2%29%2F7%29%5E2%29%2F2%29\"   DISABLED_style= \"max-width:90%; height:auto;\" > = <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=sqrt%28%281-%284%2F49%29%29%2F2%29 ALIGN=MIDDLE  ALT=\"sqrt%28%281-%284%2F49%29%29%2F2%29\"   DISABLED_style= \"max-width:90%; height:auto;\" > = <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=sqrt%28%28%2849-4%29%2F49%29%2F2%29 ALIGN=MIDDLE  ALT=\"sqrt%28%28%2849-4%29%2F49%29%2F2%29\"   DISABLED_style= \"max-width:90%; height:auto;\" > = <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=sqrt%2845%2F%2849%2A2%29%29 ALIGN=MIDDLE  ALT=\"sqrt%2845%2F%2849%2A2%29%29\"   DISABLED_style= \"max-width:90%; height:auto;\" > = <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=%283%2F7%29%2Asqrt%285%2F2%29 ALIGN=MIDDLE  ALT=\"%283%2F7%29%2Asqrt%285%2F2%29\"   DISABLED_style= \"max-width:90%; height:auto;\" > = <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=%283%2F7%29%2A%281%2F2%29%2Asqrt%2810%29 ALIGN=MIDDLE  ALT=\"%283%2F7%29%2A%281%2F2%29%2Asqrt%2810%29\"   DISABLED_style= \"max-width:90%; height:auto;\" > = <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=%283%2F14%29%2Asqrt%2810%29 ALIGN=MIDDLE  ALT=\"%283%2F14%29%2Asqrt%2810%29\"   DISABLED_style= \"max-width:90%; height:auto;\" >. \r<BR>\n" );
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document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=cos%28beta%2F2%29 ALIGN=MIDDLE  ALT=\"cos%28beta%2F2%29\"   DISABLED_style= \"max-width:90%; height:auto;\" > = <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=-sqrt%28%281%2Bcos%5E2%28beta%29%29%2F2%29 ALIGN=MIDDLE  ALT=\"-sqrt%28%281%2Bcos%5E2%28beta%29%29%2F2%29\"   DISABLED_style= \"max-width:90%; height:auto;\" > = <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=-sqrt%28%281%2B%28%28-2%29%2F7%29%5E2%29%2F2%29 ALIGN=MIDDLE  ALT=\"-sqrt%28%281%2B%28%28-2%29%2F7%29%5E2%29%2F2%29\"   DISABLED_style= \"max-width:90%; height:auto;\" > = <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=-sqrt%28%281%2B%284%2F49%29%29%2F2%29 ALIGN=MIDDLE  ALT=\"-sqrt%28%281%2B%284%2F49%29%29%2F2%29\"   DISABLED_style= \"max-width:90%; height:auto;\" > = <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=-sqrt%28%28%2849%2B4%29%2F49%29%2F2%29 ALIGN=MIDDLE  ALT=\"-sqrt%28%28%2849%2B4%29%2F49%29%2F2%29\"   DISABLED_style= \"max-width:90%; height:auto;\" > = <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=-sqrt%2853%2F%2849%2A2%29%29 ALIGN=MIDDLE  ALT=\"-sqrt%2853%2F%2849%2A2%29%29\"   DISABLED_style= \"max-width:90%; height:auto;\" > = <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=-%281%2F7%29%2Asqrt%2853%2F2%29 ALIGN=MIDDLE  ALT=\"-%281%2F7%29%2Asqrt%2853%2F2%29\"   DISABLED_style= \"max-width:90%; height:auto;\" > = <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=-%281%2F7%29%2A%28sqrt%28106%29%2F2%29 ALIGN=MIDDLE  ALT=\"-%281%2F7%29%2A%28sqrt%28106%29%2F2%29\"   DISABLED_style= \"max-width:90%; height:auto;\" > = <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=-%281%2F14%29%2Asqrt%28106%29 ALIGN=MIDDLE  ALT=\"-%281%2F14%29%2Asqrt%28106%29\"   DISABLED_style= \"max-width:90%; height:auto;\" >\r<BR>\n" );
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document.write( "&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(the sign &nbsp;\"minus\" &nbsp;because the angle &nbsp;<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=beta%2F2 ALIGN=MIDDLE  ALT=\"beta%2F2\"   DISABLED_style= \"max-width:90%; height:auto;\" >&nbsp; is in the 2-nd quadrant). \r<BR>\n" );
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document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=tan%28beta%2F2%29 ALIGN=MIDDLE  ALT=\"tan%28beta%2F2%29\"   DISABLED_style= \"max-width:90%; height:auto;\" > = <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=sin%28beta%2F2%29%2Fcos%28beta%2F2%29 ALIGN=MIDDLE  ALT=\"sin%28beta%2F2%29%2Fcos%28beta%2F2%29\"   DISABLED_style= \"max-width:90%; height:auto;\" > = <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=-%28%283%2A14%29%2F14%29%2A%28sqrt%2810%29%2Fsqrt%28106%29%29 ALIGN=MIDDLE  ALT=\"-%28%283%2A14%29%2F14%29%2A%28sqrt%2810%29%2Fsqrt%28106%29%29\"   DISABLED_style= \"max-width:90%; height:auto;\" > = <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=-3%2A%28sqrt%2810%29%2Fsqrt%28106%29%29 ALIGN=MIDDLE  ALT=\"-3%2A%28sqrt%2810%29%2Fsqrt%28106%29%29\"   DISABLED_style= \"max-width:90%; height:auto;\" >.\r<BR>\n" );
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