document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=808517>Question 808517</A>: <I><SPAN STYLE=\"word-break: break-all;\"> Use double or half angle formula to determine the value of the trigonometric function sin(19pi/12)\r<BR>\n" );
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document.write( "Do you know how to solve this?? So confusing!!! Thanks! </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #487074 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=487074\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> Use double or half angle formula to determine the value of the trigonometric function sin(19pi/12) <BR>\n" );
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document.write( "use sin half-angle formula: <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=sin%28s%2F2%29=sqrt%28%281-cos%28s%29%29%2F2%29 ALIGN=MIDDLE  ALT=\"sin%28s%2F2%29=sqrt%28%281-cos%28s%29%29%2F2%29\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "..<BR>\n" );
document.write( "sin(19pi/12)=sin(38&#960;/12)/2=sin(19&#960;/6)/2=sin(3&#960;+&#960;/6)/2<BR>\n" );
document.write( "reference angle for (3&#960;+&#960;/6)=7&#960;/6 in quadrant III where sin<0, cos<0<BR>\n" );
document.write( "sin(19&#960;/12)=sin(3&#960;+&#960;/6)/2=sin(7&#960;/6)/2=<BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=%28sin%287pi%2F6%29%2F2%29=-sqrt%28%281-cos%287pi%2F6%29%29%2F2%29=-sqrt%28%281-%28-+sqrt%283%29%2F2%29%2F2%29%29=-sqrt%28%282%2Bsqrt%283%29%29%2F4%29%29 ALIGN=MIDDLE   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "..<BR>\n" );
document.write( "calculator check:(Use sin key set to radians)<BR>\n" );
document.write( "sin(19&#960;/12)&#8776;-0.9659..<BR>\n" );
document.write( "Exact answer as calculated=<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=-sqrt%28%282%2Bsqrt%283%29%29%2F4%29%29 ALIGN=MIDDLE  ALT=\"-sqrt%28%282%2Bsqrt%283%29%29%2F4%29%29\"   DISABLED_style= \"max-width:90%; height:auto;\" >&#8776;-0.9659.. </SPAN>\n" );
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