Question 597015
<pre>
I see what you did. On your calculator, you typed this:

cos<sup>-1</sup>(<font face="symbol">Ö</font>(2/3))

and got .6154797087

when you should have typed this instead:

cos<sup>-1</sup>(<font face="symbol">Ö</font>(2)/3)

and gotten 1.079913649

It's "the square root of two" divided by three,

NOT "the square root of two-thirds"

Edwin </pre>