document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=1159694>Question 1159694</A>: <I><SPAN STYLE=\"word-break: break-all;\"> Verify the identity\r<BR>\n" );
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document.write( "Tan^2 (theta/2) = (sec theta - 1) / (sec theta + 1) </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #782732 by </B><A HREF=/tutors/aboutme.mpl?userid=MathLover1><B>MathLover1(20850)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=MathLover1><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/cgi-bin/show-face.mpl?user=MathLover1><BR>You can <A HREF=\"/cgi-bin/embed-solution.mpl?show=1&solution=782732\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> <BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=tan%5E2+%28theta%2F2%29+=+%28sec%28+theta+%29-+1%29+%2F+%28sec+%28theta%29+%2B+1%29 ALIGN=MIDDLE  ALT=\"tan%5E2+%28theta%2F2%29+=+%28sec%28+theta+%29-+1%29+%2F+%28sec+%28theta%29+%2B+1%29\"   DISABLED_style= \"max-width:90%; height:auto;\" >\r<BR>\n" );
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document.write( "manipulate left side:\r<BR>\n" );
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document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=tan%5E2+%28theta%2F2%29+ ALIGN=MIDDLE  ALT=\"tan%5E2+%28theta%2F2%29+\"   DISABLED_style= \"max-width:90%; height:auto;\" >\r<BR>\n" );
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document.write( "=<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=%281+-+cos%28theta%29%29%2F%28cos%28theta%29+%2B+1%29 ALIGN=MIDDLE  ALT=\"%281+-+cos%28theta%29%29%2F%28cos%28theta%29+%2B+1%29\"   DISABLED_style= \"max-width:90%; height:auto;\" >.....since <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=cos%28theta%29=+1%2Fsec%28theta%29 ALIGN=MIDDLE  ALT=\"cos%28theta%29=+1%2Fsec%28theta%29\"   DISABLED_style= \"max-width:90%; height:auto;\" >\r<BR>\n" );
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document.write( "=<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=%281+-+1%2Fsec%28theta%29%29%2F%281%2Fsec%28theta%29+%2B+1%29 ALIGN=MIDDLE  ALT=\"%281+-+1%2Fsec%28theta%29%29%2F%281%2Fsec%28theta%29+%2B+1%29\"   DISABLED_style= \"max-width:90%; height:auto;\" >\r<BR>\n" );
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document.write( "=<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=%28%28sec%28theta%29+-+1%29%2Fsec%28theta%29%29%2F%28%281+%2B+sec%28theta%29%29%2Fsec%28theta%29%29 ALIGN=MIDDLE   DISABLED_style= \"max-width:90%; height:auto;\" >\r<BR>\n" );
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document.write( "=<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=%28%28sec%28theta%29+-+1%29%2Fcross%28sec%28theta%29%29%29%2F%28%281+%2B+sec%28theta%29%29%2Fcross%28sec%28theta%29%29%29 ALIGN=MIDDLE   DISABLED_style= \"max-width:90%; height:auto;\" >\r<BR>\n" );
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document.write( "=<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=%28sec%28theta%29+-+1%29%2F%281+%2B+sec%28theta%29%29 ALIGN=MIDDLE  ALT=\"%28sec%28theta%29+-+1%29%2F%281+%2B+sec%28theta%29%29\"   DISABLED_style= \"max-width:90%; height:auto;\" >-> proven\r<BR>\n" );
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