document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=621607>Question 621607</A>: <I><SPAN STYLE=\"word-break: break-all;\"> please help me solve: \r<BR>\n" );
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document.write( "cosx(tan^2x+1)=secx </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #390957 by </B><A HREF=/tutors/aboutme.mpl?userid=lwsshak3><B>lwsshak3(11628)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=lwsshak3><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/images/nopicture.jpg><BR>You can <A HREF=\"/cgi-bin/embed-solution.mpl?show=1&solution=390957\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> verify identity: <BR>\n" );
document.write( "cosx(tan^2x+1)=secx<BR>\n" );
document.write( "start with left side<BR>\n" );
document.write( "cosx[(sin^2x/cos^2x)+1]<BR>\n" );
document.write( "=cosx(cos^2x+sin^2x)/cos^2x<BR>\n" );
document.write( "=cosx(1)/cos^2x<BR>\n" );
document.write( "1/cosx=secx<BR>\n" );
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document.write( "left side=right side </SPAN>\n" );
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