document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=829218>Question 829218</A>: <I><SPAN STYLE=\"word-break: break-all;\"> in triangle ABC a=6 b=7 and c=8. what is the cos A in simplest fraction? </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #499707 by </B><A HREF=/tutors/aboutme.mpl?userid=stanbon><B>stanbon(75887)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=stanbon><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=499707\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> in triangle ABC a=6 b=7 and c=8. what is the cos A in simplest fraction?<BR>\n" );
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document.write( "Use Law of Cosines::<BR>\n" );
document.write( "a^2 = b^2+c^2-2bc*cos(A)<BR>\n" );
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document.write( "cos(A) = [b^2+c^2-a^2]/(2b*c)<BR>\n" );
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document.write( "cos(A) = [49+64-36]/112 = 0.6875<BR>\n" );
document.write( "A = cos^-1(0.6875) = 46.57 degrees<BR>\n" );
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document.write( "Cheers,<BR>\n" );
document.write( "Stan H.<BR>\n" );
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