document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=743475>Question 743475</A>: <I><SPAN STYLE=\"word-break: break-all;\"> How do I verify the trig identity? \r<BR>\n" );
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document.write( "(1+sinx)^2/cos^2(x) = (1 + sinx)/ (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 #452902 by </B><A HREF=/tutors/aboutme.mpl?userid=tommyt3rd><B>tommyt3rd(5050)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=tommyt3rd><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=tommyt3rd><BR>You can <A HREF=\"/cgi-bin/embed-solution.mpl?show=1&solution=452902\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=%281%2Bsin%28x%29%29%5E2%2Fcos%5E2%28x%29+=+%281+%2B+sin%28x%29%29%2F+%281-sin%28x%29%29 ALIGN=MIDDLE  ALT=\"%281%2Bsin%28x%29%29%5E2%2Fcos%5E2%28x%29+=+%281+%2B+sin%28x%29%29%2F+%281-sin%28x%29%29\"   DISABLED_style= \"max-width:90%; height:auto;\" >\r<BR>\n" );
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document.write( "For convenience we'll denote sin(x) as sinx. First we expand the numerator and rewrite the denominator:\r<BR>\n" );
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document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=%281%2Bsinx%29%5E2%2Fcos%5E2%28x%29+=+%28%281+%2B+sinx%29%281+%2B+sinx%29%29%2F+%281%5E2-sin%5E2%28x%29%29 ALIGN=MIDDLE   DISABLED_style= \"max-width:90%; height:auto;\" >\r<BR>\n" );
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document.write( "Using the difference of squares identity for the denominator...\r<BR>\n" );
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document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=%28%281+%2B+sinx%29%281+%2B+sinx%29%29%2F+%281%5E2-sin%5E2%28x%29%29=%28%281+%2B+sinx%29%281+%2B+sinx%29%29%2F%28%281+%2B+sinx%29%281+-+sinx%29%29 ALIGN=MIDDLE   DISABLED_style= \"max-width:90%; height:auto;\" >\r<BR>\n" );
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document.write( "after cancelling...\r<BR>\n" );
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document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=%28%281+%2B+sinx%29%281+%2B+sinx%29%29%2F%28%281+%2B+sinx%29%281+-+sinx%29%29=%281+%2B+sinx%29%2F%281+-+sinx%29 ALIGN=MIDDLE   DISABLED_style= \"max-width:90%; height:auto;\" > </SPAN>\n" );
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