document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=415076>Question 415076</A>: <I><SPAN STYLE=\"word-break: break-all;\"> I don't understand how to work these types of problems: <BR>\n" );
document.write( "Sec^2 18 degrees - tan^2 18 degrees.<BR>\n" );
document.write( "Thanks! </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #291034 by </B><A HREF=/tutors/aboutme.mpl?userid=robertb><B>robertb(5830)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=robertb><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=robertb><BR>You can <A HREF=\"/cgi-bin/embed-solution.mpl?show=1&solution=291034\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> There is a variant of the Pythagorean identity: <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=%28sec+x%29%5E2+=+%28tan+x%29%5E2+%2B+1 ALIGN=MIDDLE  ALT=\"%28sec+x%29%5E2+=+%28tan+x%29%5E2+%2B+1\"   DISABLED_style= \"max-width:90%; height:auto;\" >.  Hence <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=%28sec+18%5Eo%29%5E2+=+%28tan+18%5Eo%29%5E2+%2B+1 ALIGN=MIDDLE  ALT=\"%28sec+18%5Eo%29%5E2+=+%28tan+18%5Eo%29%5E2+%2B+1\"   DISABLED_style= \"max-width:90%; height:auto;\" >, and so <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=%28sec+18%5Eo%29%5E2+-+%28tan+18%5Eo%29%5E2+=+1 ALIGN=MIDDLE  ALT=\"%28sec+18%5Eo%29%5E2+-+%28tan+18%5Eo%29%5E2+=+1\"   DISABLED_style= \"max-width:90%; height:auto;\" > </SPAN>\n" );
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