document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=844009>Question 844009</A>: <I><SPAN STYLE=\"word-break: break-all;\"> Use the formula in part c (sin(alpha+beta)=sin alpha*cos beta+cos alpha*sin beta)and the values for sin18 (1/4sqrt(5)+1) and cos18 (1/4sqrt(10+2sqrt(5)) to show that sin36=sqrt(10-2sqrt(5)/4). Hint: The resulting algebra turns out to be much easier if you first find sin^2(36), simplify, and then take the square root. \r<BR>\n" );
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document.write( "I have no idea how to prove sin36! I've tried multiple times and it never works out. Please help! </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #508707 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=508707\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> Use Google to search for \"sin(36)\" and you will<BR>\n" );
document.write( "see a nice derivation of the solution you are<BR>\n" );
document.write( "looking for.<BR>\n" );
document.write( "Cheers,<BR>\n" );
document.write( "Stan H. </SPAN>\n" );
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