document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=939561>Question 939561</A>: <I><SPAN STYLE=\"word-break: break-all;\"> Help!!!  I don't know how to do this?<BR>\n" );
document.write( "sin(2sin^-1(5/13)) </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #572545 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=572545\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> sin(2sin^-1(5/13))<BR>\n" );
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document.write( "That is a double-angle statement.<BR>\n" );
document.write( "The angle is sin^-1(5/13) = x<BR>\n" );
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document.write( "sin(2x) = 2sin(x)cos(x)<BR>\n" );
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document.write( "sin[sin^-1(5/13)] = 5/13<BR>\n" );
document.write( "cos(sin^-1(5/13)] = sqrt(13^2-5^2)/13 = sqrt(144)/13 = 12/13<BR>\n" );
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document.write( "Ans: 2(5/13)(12/13) = 120/169 = 0.71<BR>\n" );
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document.write( "Cheers,<BR>\n" );
document.write( "Stan H.<BR>\n" );
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