document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=749613>Question 749613</A>: <I><SPAN STYLE=\"word-break: break-all;\"> Please help me prove the following identities: <BR>\n" );
document.write( " a) cot^2&#963;sin^2&#963; + sin^2&#963;=1<BR>\n" );
document.write( " b) cos&#963;sec&#963;/1+tan^2&#963;=cos^2&#963;<BR>\n" );
document.write( " c) sin2x/1+cos2x=tanx<BR>\n" );
document.write( " d) csc2A = cot2A= cotA\r<BR>\n" );
document.write( "\n" );
document.write( "Thank you, \r<BR>\n" );
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document.write( "-Nie </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #456101 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=456101\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> Please help me prove the following identities: <BR>\n" );
document.write( "a) cot^2&#963;sin^2&#963; + sin^2&#963;=1<BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=cot%5E2%28x%29sin%5E2%28x%29%2Bsin%5E2%28x%29=sin%5E2%28x%29%281%2Bcot%5E2%28x%29%29=sin%5E2%28x%29%281%2B%28cos%5E2%28x%29%2Fsin%5E2%28x%29%29%29=sin%5E2%28x%29%2Bcos%5E2%28x%29=1 ALIGN=MIDDLE   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "..<BR>\n" );
document.write( "b) cos&#963;sec&#963;/1+tan^2&#963;=cos^2&#963;<BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=%28cos%28x%29sec%28x%29%29%2F%281%2Btan%5E2%28x%29%29=%28cos%28x%29sec%28x%29%29%2F%28sec%5E2%28x%29%29=%28cos%28x%29%29%2F%28sec%28x%29%29=cos%5E2%28x%29 ALIGN=MIDDLE   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "..<BR>\n" );
document.write( "c) sin2x/1+cos2x=tanx<BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=sin%282x%29%2F%281%2Bcos%282x%29%29=%282sin%28x%29cos%28x%29%29%2F%281%2B%281-2sin%28x%29%29%29=%282sin%28x%29cos%28x%29%29%2F%282%281-sin%5E2%28x%29%29%29%0D%0A=%282sin%28x%29cos%28x%29%29%2F%282%28cos%5E2%28x%29%29%29=sin%28x%29%2Fcos%28x%29=tan%28x%29 ALIGN=MIDDLE   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "d) csc2A = cot2A= cotA<BR>\n" );
document.write( "??  </SPAN>\n" );
document.write( "</TD></TR></TABLE>\n" );