document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=674533>Question 674533</A>: <I><SPAN STYLE=\"word-break: break-all;\"> Here is the trig problem:\r<BR>\n" );
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document.write( "Derive the identity for tan(a-b)using tan(a-b)=tan[a+(-b)].\r<BR>\n" );
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document.write( "After applying the formula for the tangent of the sum of two angles, use the fact that the tangent is an odd function.<BR>\n" );
document.write( "THANK YOU! </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #419307 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=419307\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> Derive the identity for tan(a-b)using tan(a-b)=tan[a+(-b)]. <BR>\n" );
document.write( "After applying the formula for the tangent of the sum of two angles, use the fact that the tangent is an odd function.<BR>\n" );
document.write( "**<BR>\n" );
document.write( "if function is even, f(-x)=f(x)<BR>\n" );
document.write( "if function is odd, f(-x)=-f(x)<BR>\n" );
document.write( "tan, being an odd function:<BR>\n" );
document.write( "tan(-x)=-tan(x)<BR>\n" );
document.write( "..<BR>\n" );
document.write( "Identity: tan(a+b)=(tana+tanb)/(1-tana tanb)<BR>\n" );
document.write( "tan[(a+(-b)]=(tana+tan(-b))/(1-tana tan(-b))<BR>\n" );
document.write( "tan(-b)=-tan b<BR>\n" );
document.write( "tan(a-b)=(tana-tanb)/(1+tana tanb)<BR>\n" );
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