document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=137400>Question 137400</A>This question is from textbook <A HREF=http://www.amazon.com/exec/obidos/ASIN/0534380298/algebrahomeworkh>Alegbra and Trigonometry</A><BR>\n" );
document.write( ": <I><SPAN STYLE=\"word-break: break-all;\"> Hi, I'm having difficulty with this type of problem.  It's verifying trigonometric identities and this one is giving me trouble.  The problem itself is tanvsinv/tanv+sinv=tanv-sinv/tanvsinv.  If you could help me how to solve this problem, I would be very grateful.  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 #100539 by </B><A HREF=/tutors/aboutme.mpl?userid=stanbon><B>stanbon(75887)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=stanbon><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=100539\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> tanvsinv/tanv+sinv=tanv-sinv/tanvsinv\r<BR>\n" );
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document.write( "Cross-multiply to get: <BR>\n" );
document.write( "(tan*sin^2 = tan^2-sin^2\r<BR>\n" );
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document.write( "Divide thru by sin2 to get:\r<BR>\n" );
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document.write( "tan^2 = sec^2 -1\r<BR>\n" );
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document.write( "This is a pythagorean identity:\r<BR>\n" );
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document.write( "tan^2 = tan^2<BR>\n" );
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document.write( "Cheers,<BR>\n" );
document.write( "Stan H. </SPAN>\n" );
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