document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=622497>Question 622497</A>: <I><SPAN STYLE=\"word-break: break-all;\"> please help me find the exact values of:\r<BR>\n" );
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document.write( "sin2u \r<BR>\n" );
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document.write( "given: sinu= -4/5 and pi < u 3pi/2 </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #391409 by </B><A HREF=/tutors/aboutme.mpl?userid=lwsshak3><B>lwsshak3(11628)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=lwsshak3><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=391409\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> find the exact values of: <BR>\n" );
document.write( "sin2u <BR>\n" );
document.write( "given: sinu= -4/5 and pi < u 3pi/2\r<BR>\n" );
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document.write( "sinu=-4/5 in quadrants III and IV where sin<0<BR>\n" );
document.write( "since quadrant IV is not in the domain,(&#960;,3&#960;/2), reference angle is in quadrant III<BR>\n" );
document.write( "sinu=-4/5=opposite side/hypotenuse<BR>\n" );
document.write( "adjacent side=3 since you are working with a 3-4-5 right triangle<BR>\n" );
document.write( "cosu=-3/5 in quadrants III where cos<0<BR>\n" );
document.write( "sin 2u=2sinucosu<BR>\n" );
document.write( "=2*-4/5*-3/5<BR>\n" );
document.write( "=24/25 </SPAN>\n" );
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