document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=205909>Question 205909</A>: <I><SPAN STYLE=\"word-break: break-all;\"> why does sin(theta + pi/2)= + cos theta ? </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #155477 by </B><A HREF=/tutors/aboutme.mpl?userid=stanbon><B>stanbon(75887)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=stanbon><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=155477\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> why does sin(theta + pi/2)= + cos theta )?<BR>\n" );
document.write( "----<BR>\n" );
document.write( "Try this:<BR>\n" );
document.write( "sin(theta+(pi/2)) = sin(theta)*cos(pi/2) - cos(theta)*sin(pi/2)<BR>\n" );
document.write( "= sin(theta)*0 - cos(theta)(1)<BR>\n" );
document.write( "---<BR>\n" );
document.write( "= -cos(theta)<BR>\n" );
document.write( "=======================<BR>\n" );
document.write( "So sin(theta+(pi/2)) does NOT equal cos(theta)<BR>\n" );
document.write( "====================================================<BR>\n" );
document.write( "Cheers,<BR>\n" );
document.write( "Stan H. </SPAN>\n" );
document.write( "</TD></TR></TABLE>\n" );