document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=1003042>Question 1003042</A>: <I><SPAN STYLE=\"word-break: break-all;\"> How do I prove that cos(pi/2 - x) = sinx by using the formula cos(x+y) </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #619909 by </B><A HREF=/tutors/aboutme.mpl?userid=jkc52><B>jkc52(5)</B></A><img src=\"/images/stars/iconNewId_16x16.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=jkc52><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=619909\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> we have the expression<BR>\n" );
document.write( "cos(x-y)=cosxcosy+sinxsiny<BR>\n" );
document.write( "thus letting x=pi/2 and y=x<BR>\n" );
document.write( "we have cos(pi/2 - x)=(0)*(cosy)+(1)*(sinx)<BR>\n" );
document.write( "=sinx </SPAN>\n" );
document.write( "</TD></TR></TABLE>\n" );