document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=829183>Question 829183</A>: <I><SPAN STYLE=\"word-break: break-all;\"> Hello, I was hoping you could help me verify this identity. I'm actually really good at the various identities and verifying them, but this problem is proving really complex for me and I just can't seem to get through it. I was hoping you could really show me step-by-step on how to get the answer for this problem.\r<BR>\n" );
document.write( "\n" );
document.write( "It is:<BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=+%28%28cos%28a%29-cos%28b%29%29%2F%28sin%28a%29%2Bsin%28b%29%29%29%2B%28%28sin%28a%29-sin%28b%29%29%2F%28cos%28a%29%2Bcos%28b%29%29%29=+0+ ALIGN=MIDDLE   DISABLED_style= \"max-width:90%; height:auto;\" >\r<BR>\n" );
document.write( "\n" );
document.write( "Thank you for your help in advance, I appreciate you taking the time to assist. </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #499709 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=499709\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=%28%28cos%28a%29-cos%28b%29%29%2F%28sin%28a%29%2Bsin%28b%29%29%29%2B%28%28sin%28a%29-sin%28b%29%29%2F%28cos%28a%29%2Bcos%28b%29%29%29=%28cos%5E2%28a%29-cos%5E2%28b%29%2Bsin%5E2%28a%29-sin%5E2%28b%29%29%2F%28%28sin%28a%29%2Bsin%28b%29%29%28cos%28a%29%2Bcos%28b%29%29%29=%28cos%5E2%28a%29%2Bsin%5E2%28a%29-cos%5E2%28b%29-sin%5E2%28b%29%29%2F%28%28sin%28a%29%2Bsin%28b%29%29%28cos%28a%29%2Bcos%28b%29%29%29=%28cos%5E2%28a%29%2Bsin%5E2%28a%29-%28cos%5E2%28b%29%2Bsin%5E2%28b%29%29%29%2F%28%28sin%28a%29%2Bsin%28b%29%29%28cos%28a%29%2Bcos%28b%29%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=%281-1%29%2F%28%28sin%28a%29%2Bsin%28b%29%29%28cos%28a%29%2Bcos%28b%29%29%29=%280%29%2F%28%28sin%28a%29%2Bsin%28b%29%29%28cos%28a%29%2Bcos%28b%29%29%29=0 ALIGN=MIDDLE   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "verified: left side=right side </SPAN>\n" );
document.write( "</TD></TR></TABLE>\n" );