document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=813090>Question 813090</A>: <I><SPAN STYLE=\"word-break: break-all;\"> prove identity <BR>\n" );
document.write( "(2tanx)(secx)= 1/1-sinx - 1/1+sinx </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #489479 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=489479\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> (2tanx)(secx)= 1/1-sinx - 1/1+sinx<BR>\n" );
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document.write( "(2/cos^2) = 1/(1-sin) - 1/(1+sinx)<BR>\n" );
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document.write( "2/(1-sin^2) = 1/(1-sin) - 1/(1+sin)<BR>\n" );
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document.write( "Multiply thru by 1-sin^2 to get:<BR>\n" );
document.write( "2 = (1+sin) - (1-sin)<BR>\n" );
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document.write( "2 = 2sin(x)<BR>\n" );
document.write( "sin(x) = 1<BR>\n" );
document.write( "---<BR>\n" );
document.write( "x = pi/2<BR>\n" );
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document.write( "Cheers,<BR>\n" );
document.write( "Stan H.<BR>\n" );
document.write( "============ </SPAN>\n" );
document.write( "</TD></TR></TABLE>\n" );