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

Question

anonymous · Answer

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

anonymous · Answer

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.

anonymous · Answer

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

anonymous · Answer

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