## anonymous 4 years ago Evaluate the expression in radian and degrees; without using a calculator. Please explain or show work! thank you! :]

1. anonymous

$\tan^{-1} (\sqrt{3}/3)$

2. anonymous

If you know the unit circle values all you have to do is remember which values give you $\tan \sqrt{3}/3$ If you only know sine and cosine values then sine would have to be 1/2 and cosine would be the sqrt of 3 over 2.

3. anonymous

You will have two answers for each since tangent is positive in both quadrant I and III

4. anonymous

i'm confused. How do you know the values?