document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=919499>Question 919499</A>: <I><SPAN STYLE=\"word-break: break-all;\"> How do you find the trigonometric function value of cosine of theta<BR>\n" );
document.write( " equals 4/9 and theta is in quadrant IV </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #557764 by </B><A HREF=/tutors/aboutme.mpl?userid=Theo><B>Theo(13342)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=Theo><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/cgi-bin/show-face.mpl?user=Theo><BR>You can <A HREF=\"/cgi-bin/embed-solution.mpl?show=1&solution=557764\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> cosine (theta) = 4/9<BR>\n" );
document.write( "use your calculator to find that arc-cosine(4/9) = 63.61220004 degrees.<BR>\n" );
document.write( "that's the angle in the first quadrant.<BR>\n" );
document.write( "in the fourth quadrant, theta would be equal to 360 - 63.61220004 degrees which the calculator shows as 296.3878 degrees.<BR>\n" );
document.write( "find the cosine of 296.3878 degrees in your calculator and it should tell you that the cosine of 296.3878 degrees is equal to .4444444451.<BR>\n" );
document.write( "4/9 is equal to .444444444 so you're pretty close with any difference due to rounding error.<BR>\n" );
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