document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=39058>Question 39058</A>: <I><SPAN STYLE=\"word-break: break-all;\"> Find the exact value by using half-angle formula.<BR>\n" );
document.write( "a)sin22.5     b)sin7pie/8 </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #24496 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=24496\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> Find the exact value by using half-angle formula.<BR>\n" );
document.write( "a)sin22.5=sin(45/2)= sqrt[(1-cos(45))/2]<BR>\n" );
document.write( " = sqrt[(1-(sqrt(2)/2))/2]=[sqrt[(2-sqrt(2)]]/2<BR>\n" );
document.write( "=0.38268343...   \r<BR>\n" );
document.write( "\n" );
document.write( "b)sin(7pie/8)= sin[(1/2)(7pi/4)]=<BR>\n" );
document.write( "sqrt[(1-cos(7pi/4))/2]=sqrt[1-(sqrt(2)/2)/2]<BR>\n" );
document.write( "=[sqrt[2-sqrt(2)]]/2=0.38268343...\r<BR>\n" );
document.write( "\n" );
document.write( "Cheers,<BR>\n" );
document.write( "Stan H. </SPAN>\n" );
document.write( "</TD></TR></TABLE>\n" );