document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=732452>Question 732452</A>: <I><SPAN STYLE=\"word-break: break-all;\"> given that cosA=1/3 where A is an acute angle, the exact value of cos A/2 equals </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #447853 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=447853\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> given that cosA=1/3 where A is an acute angle, the exact value of cos A/2 equals<BR>\n" );
document.write( "***<BR>\n" );
document.write( "use half-angle formula for cos:<BR>\n" );
document.write( "cos(A/2)=&#8730;[(1+cosA)/2]=&#8730;(1+(1/3))/2)=&#8730;((4/3)/2)=&#8730;(4/6)=&#8730;(2/3)<BR>\n" );
document.write( "Check with calculator:<BR>\n" );
document.write( "cosA=1/3<BR>\n" );
document.write( "A&#8776;70.5288º<BR>\n" );
document.write( "A/2&#8776;35.2644º<BR>\n" );
document.write( "cos(A/2)&#8776;cos35.2644º&#8776;0.8165<BR>\n" );
document.write( "&#8730;(2/3)&#8776;0.8165 </SPAN>\n" );
document.write( "</TD></TR></TABLE>\n" );