document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=1018512>Question 1018512</A>: <I><SPAN STYLE=\"word-break: break-all;\"> PROVE THAT:<BR>\n" );
document.write( "sinx.cosx=-1<BR>\n" );
document.write( " </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #634601 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=634601\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> PROVE THAT:<BR>\n" );
document.write( "sinx.cosx=-1<BR>\n" );
document.write( "---------------------<BR>\n" );
document.write( "That is not an identity.<BR>\n" );
document.write( "It can be disproven with 1 counter-example:<BR>\n" );
document.write( "sin(0)*cos(0) = 0 not -1<BR>\n" );
document.write( "------------<BR>\n" );
document.write( "You can try to solve for x:<BR>\n" );
document.write( "sinx*cosx=-1<BR>\n" );
document.write( "2sin(x)*cos(x) = -2<BR>\n" );
document.write( "sin(2x) = -2<BR>\n" );
document.write( "No solution. </SPAN>\n" );
document.write( "</TD></TR></TABLE>\n" );