document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=867175>Question 867175</A>: <I><SPAN STYLE=\"word-break: break-all;\"> Let sin x = 1/3, with x in quadrant ll and let cos y = 3/4  with y in quadrant l. Find cos (x+y) and sin (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 #522858 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=522858\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> Let sin x = 1/3, with x in quadrant ll and let cos y = 3/4 with y in quadrant l. Find cos (x+y) and sin (x+y<BR>\n" );
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document.write( "cos(x) = -sqrt(3^2-1)/3 = -sqrt(8)/3<BR>\n" );
document.write( "sin(y) = sqrt(4^2-3^2)/4 = sqrt(7)/4<BR>\n" );
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document.write( "cos(x+y) = cos(x)*cos(y) - sin(x)sin(y) <BR>\n" );
document.write( "Substitute to get the cos(x+y) value<BR>\n" );
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document.write( "sin(x+y) = sin(x)cos(y)+cos(x)sin(y)<BR>\n" );
document.write( "Substitute gto get the sin(x+y) value<BR>\n" );
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document.write( "Cheers,<BR>\n" );
document.write( "Stan H.<BR>\n" );
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