document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=969675>Question 969675</A>: <I><SPAN STYLE=\"word-break: break-all;\"> verify ((tan(x+y)-tany)/(1 +tan(x+y)tany))=tanx <BR>\n" );
document.write( " </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #592480 by </B><A HREF=/tutors/aboutme.mpl?userid=lwsshak3><B>lwsshak3(11628)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=lwsshak3><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=592480\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> verify ((tan(x+y)-tany)/(1 +tan(x+y)tany))=tanx<BR>\n" );
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document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=Identity%3A+tan%28a-b%29=%28tana-tanb%29%2F%281%2Btana%2Atanb%29 ALIGN=MIDDLE  ALT=\"Identity%3A+tan%28a-b%29=%28tana-tanb%29%2F%281%2Btana%2Atanb%29\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "start with left side:<BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=%28%28tan%28x%2By%29-tany%29%29%2F%281+%2Btan%28x%2By%29tany%29=tan%28x%2By-y%29=tanx ALIGN=MIDDLE  ALT=\"%28%28tan%28x%2By%29-tany%29%29%2F%281+%2Btan%28x%2By%29tany%29=tan%28x%2By-y%29=tanx\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "verified: left side=right side </SPAN>\n" );
document.write( "</TD></TR></TABLE>\n" );