document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=697348>Question 697348</A>: <I><SPAN STYLE=\"word-break: break-all;\"> 1. tan^2 20 degree - sec^2 20 degree<BR>\n" );
document.write( "2. cos^2(10 degree 5`) + sin^2 (10 degree 5`)<BR>\n" );
document.write( "3. 2sec^2 2pie/7 cos^2 2pie/7 </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #429910 by </B><A HREF=/tutors/aboutme.mpl?userid=god2012><B>god2012(113)</B></A><img src=\"/images/stars/stars-09.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=god2012><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=god2012><BR>You can <A HREF=\"/cgi-bin/embed-solution.mpl?show=1&solution=429910\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> Solution :\r<BR>\n" );
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document.write( "1. <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=tan%5E2+%2820%29-+sec%5E2+%2820%29+ ALIGN=MIDDLE  ALT=\"tan%5E2+%2820%29-+sec%5E2+%2820%29+\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=+%28sin%5E2+%2820%29+-+1%29%2Fcos%5E2+%2820%29 ALIGN=MIDDLE  ALT=\"+%28sin%5E2+%2820%29+-+1%29%2Fcos%5E2+%2820%29\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=-cos%5E2+%2820%29+%2F+cos%5E2+%2820%29+=+-1 ALIGN=MIDDLE  ALT=\"-cos%5E2+%2820%29+%2F+cos%5E2+%2820%29+=+-1\"   DISABLED_style= \"max-width:90%; height:auto;\" >\r<BR>\n" );
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document.write( "2. <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=cos%5E2%2810+degree+5%60%29+%2B+sin%5E2+%2810+degree+5%60%29 ALIGN=MIDDLE  ALT=\"cos%5E2%2810+degree+5%60%29+%2B+sin%5E2+%2810+degree+5%60%29\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "let 10 degree 5 = t<BR>\n" );
document.write( "therefore, the equation becomes<BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=cos%5E2+%28t%29+%2B+sin%5E2+%28t%29+=+1+ ALIGN=MIDDLE  ALT=\"cos%5E2+%28t%29+%2B+sin%5E2+%28t%29+=+1+\"   DISABLED_style= \"max-width:90%; height:auto;\" >\r<BR>\n" );
document.write( "\n" );
document.write( "3. <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=2sec%5E2+%282pie%2F7%29+cos%5E2+%282pie%2F7%29 ALIGN=MIDDLE  ALT=\"2sec%5E2+%282pie%2F7%29+cos%5E2+%282pie%2F7%29\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "let 2pie/7 = t<BR>\n" );
document.write( "therefore, the equation becomes<BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=2sec%5E2+%28t%29+%2A+cos%5E2+%28t%29 ALIGN=MIDDLE  ALT=\"2sec%5E2+%28t%29+%2A+cos%5E2+%28t%29\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "=<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=+%282%2Fcos%5E2+%28t%29%29+%2A+cos%5E2+%28t%29 ALIGN=MIDDLE  ALT=\"+%282%2Fcos%5E2+%28t%29%29+%2A+cos%5E2+%28t%29\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( " because sec (t) = 1/cos (t)<BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=2 ALIGN=MIDDLE  ALT=\"2\"   DISABLED_style= \"max-width:90%; height:auto;\" > </SPAN>\n" );
document.write( "</TD></TR></TABLE>\n" );