document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=1154938>Question 1154938</A>: <I><SPAN STYLE=\"word-break: break-all;\"> Thank you!!  Struggling with this.\r<BR>\n" );
document.write( "\n" );
document.write( "Given sinx=-(2)/(3), 180 degrees less than or equal to, x, less than or equal to 270 degrees and cosy=(4)/(7), 270 degrees less than or equal to, y, less than or equal to 360 degrees, find the exact value of tan(x+y). </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #777495 by </B><A HREF=/tutors/aboutme.mpl?userid=greenestamps><B>greenestamps(13203)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=greenestamps><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=greenestamps><BR>You can <A HREF=\"/cgi-bin/embed-solution.mpl?show=1&solution=777495\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> <br><BR>\n" );
document.write( "(1a) Given sinx = -2/3 in quadrant III, use sin^2 + cos^2 = 1 to find cosx, and give it the negative value since cosine is negative in quadrant III.<br><BR>\n" );
document.write( "(1b) Given cosy 4/7 in quadrant IV, use sin^2 + cos^2 = 1 to find sinx, and give it the negative value since sine is negative in quadrant IV.<br><BR>\n" );
document.write( "(2a) Find sin(x+y), using sin(x+y) = sinx*cosy+cosx*siny<br><BR>\n" );
document.write( "(2b) Find cos(x+y), using cos(x+y) = cosx*cosy-sinx*siny<br><BR>\n" );
document.write( "(3) Find tan (x+y), using tan(x+y) = sin(x+y)/cos(x+y)<br><BR>\n" );
document.write( "If you find you are still struggling with this, re-post showing the work you have done.<br><BR>\n" );
document.write( " </SPAN>\n" );
document.write( "</TD></TR></TABLE>\n" );