document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=1177771>Question 1177771</A>: <I><SPAN STYLE=\"word-break: break-all;\"> Given sin β  5/13 in QII, find the exact value of the following:<BR>\n" );
document.write( "a. sin(2β)<BR>\n" );
document.write( "b. cos(2β)<BR>\n" );
document.write( "c. tan(2β) </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #806885 by </B><A HREF=/tutors/aboutme.mpl?userid=mananth><B>mananth(16946)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=mananth><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=mananth><BR>You can <A HREF=\"/cgi-bin/embed-solution.mpl?show=1&solution=806885\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> \r<BR>\n" );
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document.write( "sin b = 5/13\r<BR>\n" );
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document.write( "cos b = —12/13\r<BR>\n" );
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document.write( "tan b = —5/12\r<BR>\n" );
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document.write( "sin2b = —120/169\r<BR>\n" );
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document.write( "cos 2b = 2 cos^2 b —1 = 288/169 —1 = 119/169\r<BR>\n" );
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document.write( "tan 2 b = —5/6 / 1-25/144 = — 120/144 / 119/144\r<BR>\n" );
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document.write( "= -120/119 </SPAN>\n" );
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