document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=728484>Question 728484</A>: <I><SPAN STYLE=\"word-break: break-all;\"> How do I find the exact value of 1-cos squared10 degrees - Cos squared80 degrees? Can you please go step by step so I can learn how to do it properly? Thank you \r<BR>\n" );
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document.write( "Note: There is nothing between the cos squared and the degrees on either side  </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #445453 by </B><A HREF=/tutors/aboutme.mpl?userid=Alan3354><B>Alan3354(69443)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=Alan3354><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=Alan3354><BR>You can <A HREF=\"/cgi-bin/embed-solution.mpl?show=1&solution=445453\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> How do I find the exact value of 1-cos squared10 degrees - Cos squared80 degrees?<BR>\n" );
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document.write( "cos(80) = sin(90-80) = sin(10)<BR>\n" );
document.write( "--------<BR>\n" );
document.write( "1 - cos^2(10) - cos^2(80)<BR>\n" );
document.write( "= 1 - cos^2(10) - sin^2(10)<BR>\n" );
document.write( "1 - cos^2 = sin^2<BR>\n" );
document.write( "-----<BR>\n" );
document.write( "= sin^2(10) - sin^2(10)<BR>\n" );
document.write( "= 0<BR>\n" );
document.write( "  </SPAN>\n" );
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