document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=1053798>Question 1053798</A>: <I><SPAN STYLE=\"word-break: break-all;\"> Find the exact values of sin 2u, cos 2u, and tan 2u using the double-angle formulas.cos u = &#8722; 15/17,  &#960;/2 < u < &#960; </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #669048 by </B><A HREF=/tutors/aboutme.mpl?userid=Alan3354><B>Alan3354(69443)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=Alan3354><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=Alan3354><BR>You can <A HREF=\"/cgi-bin/embed-solution.mpl?show=1&solution=669048\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> Find the exact values of sin 2u, cos 2u, and tan 2u using the double-angle formulas.cos u = &#8722; 15/17,  &#960;/2 < u < &#960;<BR>\n" );
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document.write( "Find sin(u):<BR>\n" );
document.write( "sin = sqrt(1 - cos^2) = +8/17 (+ in Q2)<BR>\n" );
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document.write( "sin(2u) = 2*sin(u)*cos(u)<BR>\n" );
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document.write( "Then cos(2u) = sqrt(1 - sin^2(2u))<BR>\n" );
document.write( "Then tan(2u) = sin(2u)/cos(2u)<BR>\n" );
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