I have homework where i need to do the following:

3. For what values of t on the interval [0,2π] is: a. sin(t) = -1/2

b. tan(t) = -√3

*in part 'b' the symbol is a square root, meaning the negative square root of 3*

I think it can be solved using the unit circle (..?) but I can't figure it out.

Help?