document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=843891>Question 843891</A>: <I><SPAN STYLE=\"word-break: break-all;\"> if sin^-1, x=2 pi/5 find the value of cos^-1 </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #508390 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=508390\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> if sin^-1, x=2 pi/5 find the value of cos^-1<BR>\n" );
document.write( "sin^-1(x)=2&#960;/5<BR>\n" );
document.write( "cos^1(x)=&#960;/2-2&#960;/5=&#960;/10<BR>\n" );
document.write( "check:<BR>\n" );
document.write( "sin(2&#960;/5)&#8776;0.951<BR>\n" );
document.write( "cos(&#960;/10)=0.951<BR>\n" );
document.write( "note: sin(x)=cos(&#960;/2-x) </SPAN>\n" );
document.write( "</TD></TR></TABLE>\n" );