Question 1173623
<pre>
You can also do it this way:

{{{cos(theta)}}}{{{""=""}}}{{{(u*v)/("|u||v|")}}}

{{{cos(theta)}}}{{{""=""}}}{{{("(-6)(-9)"+"(-2)(4)")/(sqrt((-6)^2+(-2)^2)sqrt((-9)^2+(4)^2))}}}

{{{cos(theta)}}}{{{""=""}}}{{{(54+(-8))/(sqrt(36+4)sqrt(81+16)))}}}

{{{cos(theta)}}}{{{""=""}}}{{{(46)/(sqrt(40)sqrt(97))}}}

{{{cos(theta)}}}{{{""=""}}}{{{(46)/sqrt(38800)}}}

{{{cos(theta)}}}{{{""=""}}}{{{0.7384854939}}}

{{{theta}}}{{{""=""}}}{{{42.3974378^o}}}

{{{theta}}}{{{""=""}}}{{{"42.40"^o}}}

Edwin</pre>