document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=720163>Question 720163</A>: <I><SPAN STYLE=\"word-break: break-all;\"> Hello tutor, How do I prove this identity?\r<BR>\n" );
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document.write( "(sinA+cosA)(sinB+cosB)= sin(A+B)+cos(A-B)\r<BR>\n" );
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document.write( "Thanks </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #441689 by </B><A HREF=/tutors/aboutme.mpl?userid=lynnlo><B>lynnlo(4176)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=lynnlo><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=441689\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> (sinA+B)+cos(a-b)=(sinA+cosA)(sinB+cosB) </SPAN>\n" );
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