document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=1197232>Question 1197232</A>: <I><SPAN STYLE=\"word-break: break-all;\"> If sec x= 3/2 and cosec y= 3; determine cos (x+y)\r<BR>\n" );
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document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #830418 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=830418\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> If sec x= 3/2 and cosec y= 3; determine cos (x+y)<BR>\n" );
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document.write( "sec = 3/2 ---> cos(x) = 2/3<BR>\n" );
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document.write( "csc = 3 ----> sin(y) = 1/3<BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=cos%28y%29+=+sqrt%281+-+sin%5E2%28y%29%29+=+sqrt%288%2F9%29+=+2sqrt%282%29%2F3 ALIGN=MIDDLE  ALT=\"cos%28y%29+=+sqrt%281+-+sin%5E2%28y%29%29+=+sqrt%288%2F9%29+=+2sqrt%282%29%2F3\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
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document.write( "cos(x+y) = cos(x)*cos(y) - sin(x)*sin(y)  ------  I'm pretty sure.<BR>\n" );
document.write( "Look it up at \"half-angle formulas\" on Wikipedia.<BR>\n" );
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