document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=889169>Question 889169</A>: <I><SPAN STYLE=\"word-break: break-all;\"> What is <BR>\n" );
document.write( "sin(u+v)+sin(u-v)/cos(u+v)+cos(u-v)=tan (u)\r<BR>\n" );
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document.write( "I have tried answering it:<BR>\n" );
document.write( "LHS>>><BR>\n" );
document.write( "=[sin(u)cos(v)+cos(u)sin(v)]+[sin(u)cos(v)+cos(u)sin(v)]/[cos(u)cos(v)-sin(u)sin(v)]+[cos(u)cos(v)+sin(u)sin(v)]<BR>\n" );
document.write( "=sin(u)cos(v)+sin(u)cos(v)/cos(u)cos(v)+cos(u)cos(v)<BR>\n" );
document.write( "=2sin(u)cos(v)/2cos(u)cos(v)\r<BR>\n" );
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document.write( "and i'm stuck here. I don't know how i'll make it equal to the RHS (tan u).<BR>\n" );
document.write( "Please help me out. Thanks </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #537945 by </B><A HREF=/tutors/aboutme.mpl?userid=Fombitz><B>Fombitz(32388)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=Fombitz><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=Fombitz><BR>You can <A HREF=\"/cgi-bin/embed-solution.mpl?show=1&solution=537945\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> It's right there.<BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=%282sin%28u%29cos%28v%29%29%2F%282cos%28u%29cos%28v%29%29 ALIGN=MIDDLE  ALT=\"%282sin%28u%29cos%28v%29%29%2F%282cos%28u%29cos%28v%29%29\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "Cancel out the <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=2cos%28v%29 ALIGN=MIDDLE  ALT=\"2cos%28v%29\"   DISABLED_style= \"max-width:90%; height:auto;\" > terms from numerator and denominator.<BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=sin%28u%29%2Fcos%28u%29 ALIGN=MIDDLE  ALT=\"sin%28u%29%2Fcos%28u%29\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=tan%28u%29 ALIGN=MIDDLE  ALT=\"tan%28u%29\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( " </SPAN>\n" );
document.write( "</TD></TR></TABLE>\n" );