document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=154114>Question 154114</A>: <I><SPAN STYLE=\"word-break: break-all;\"> Verify the identity help needed?\r<BR>\n" );
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document.write( "sinx+siny/sinx-siny= tan(x+y/2)cot(x-y/2) </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #113462 by </B><A HREF=/tutors/aboutme.mpl?userid=orca><B>orca(409)</B></A><img src=\"/images/stars/stars-10.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=orca><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=113462\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> Use these two formulas:<BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=sin+x+%2B+sin+y+=+2sin%28%28x%2By%29%2F2%29%2Acos%28%28x-y%29%2F2%29 ALIGN=MIDDLE  ALT=\"sin+x+%2B+sin+y+=+2sin%28%28x%2By%29%2F2%29%2Acos%28%28x-y%29%2F2%29\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=sin+x+-+sin+y+=+2cos%28%28x%2By%29%2F2%29%2Asin%28%28x-y%29%2F2%29 ALIGN=MIDDLE  ALT=\"sin+x+-+sin+y+=+2cos%28%28x%2By%29%2F2%29%2Asin%28%28x-y%29%2F2%29\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "So<BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=%28sinx%2Bsiny%29%2F%28sinx-siny%29 ALIGN=MIDDLE  ALT=\"%28sinx%2Bsiny%29%2F%28sinx-siny%29\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "=<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=%282sin%28%28x%2By%29%2F2%29%2Acos%28%28x-y%29%2F2%29%29%2F%282cos%28%28x%2By%29%2F2%29%2Asin%28%28x-y%29%2F2%29%29 ALIGN=MIDDLE   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "=<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=%28cross%282%29sin%28%28x%2By%29%2F2%29%2Acos%28%28x-y%29%2F2%29%29%2F%28cross%282%29cos%28%28x%2By%29%2F2%29%2Asin%28%28x-y%29%2F2%29%29 ALIGN=MIDDLE   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "=<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=%28sin%28%28x%2By%29%2F2%29%2Acos%28%28x-y%29%2F2%29%29%2F%28cos%28%28x%2By%29%2F2%29%2Asin%28%28x-y%29%2F2%29%29 ALIGN=MIDDLE   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "=<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=%28sin%28%28x%2By%29%2F2%29%2Fcos%28%28x%2By%29%2F2%29%29%2A%28cos%28%28x-y%29%2F2%29%2Fsin%28%28x-y%29%2F2%29%29 ALIGN=MIDDLE   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "=<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=tan%28%28x%2By%29%2F2%29cot%28%28x-y%29%2F2%29 ALIGN=MIDDLE  ALT=\"tan%28%28x%2By%29%2F2%29cot%28%28x-y%29%2F2%29\"   DISABLED_style= \"max-width:90%; height:auto;\" >\r<BR>\n" );
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document.write( " </SPAN>\n" );
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