document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=1080511>Question 1080511</A>: <I><SPAN STYLE=\"word-break: break-all;\"> How do you prove that sin^2 theta equals (sec^2 theta)(cos^2 theta) minus 1/sec^2theta is an identity  </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #694675 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=694675\">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=sin%5E2+%28theta%29+=%28sec%5E2+%28theta%29%29%28cos%5E2+%28theta%29%29+-1%2Fsec%5E2%28theta%29 ALIGN=MIDDLE   DISABLED_style= \"max-width:90%; height:auto;\" >\r<BR>\n" );
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document.write( "start withe right side and get to left side:\r<BR>\n" );
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document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=%28sec%5E2+%28theta%29%29%28cos%5E2+%28theta%29%29+-1%2Fsec%5E2%28theta%29 ALIGN=MIDDLE  ALT=\"%28sec%5E2+%28theta%29%29%28cos%5E2+%28theta%29%29+-1%2Fsec%5E2%28theta%29\"   DISABLED_style= \"max-width:90%; height:auto;\" >\r<BR>\n" );
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document.write( "since <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=sec%5E2%28theta%29+=+%281%2F%28cos%5E2%28theta%29%29%29 ALIGN=MIDDLE  ALT=\"sec%5E2%28theta%29+=+%281%2F%28cos%5E2%28theta%29%29%29\"   DISABLED_style= \"max-width:90%; height:auto;\" >, we have\r<BR>\n" );
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document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=%281%2F%28cos%5E2%28theta%29%29%29%28cos%5E2+%28theta%29%29+-1%2F%28%281%2F%28cos%28theta%29%29%29%5E2%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=%281%2Fcross%28%28cos%5E2%28theta%29%29%29%29%28cross%28cos%5E2+%28theta%29%29%29+-%28cos%5E2%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=1+-cos%5E2%28theta%29 ALIGN=MIDDLE  ALT=\"1+-cos%5E2%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=+sin%5E2+%28theta%29 ALIGN=MIDDLE  ALT=\"+sin%5E2+%28theta%29\"   DISABLED_style= \"max-width:90%; height:auto;\" >\r<BR>\n" );
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document.write( " </SPAN>\n" );
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