document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=284287>Question 284287</A>: <I><SPAN STYLE=\"word-break: break-all;\"> I do not understand why Sin(90 + X) = CosX<BR>\n" );
document.write( "I know how the 1st, 2nd ,3rd and 4th kwadrent work but i do not understand.<BR>\n" );
document.write( "Cos(90+X)=-SinX<BR>\n" );
document.write( "Tan(90+X0=-CotX<BR>\n" );
document.write( "Sin(180+X)=-SinX<BR>\n" );
document.write( "Cot(180+X)=CotX </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #206280 by </B><A HREF=/tutors/aboutme.mpl?userid=vinaygar><B>vinaygar(1)</B></A><img src=\"/images/stars/iconNewId_16x16.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=vinaygar><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=206280\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> sin(90+x)=cosx<BR>\n" );
document.write( "L.H.S=sin(90+x)=sin90+sinx<BR>\n" );
document.write( "=1+sinx {since sin90=1}<BR>\n" );
document.write( "=cosx{since 1+sinx=cosx} </SPAN>\n" );
document.write( "</TD></TR></TABLE>\n" );