To the nearest degree, determine all possible values of θ in the domain -360° ≤ θ ≤ 360° given cos θ = 1/3.

When I did inverse cos, I got approximately 71°. The other suitable coterminal angle would be -289°. However, my textbook got an answer of -79° and 289°. Is this an error, or did I do something wrong? And if I did, how would I get the correct answer?

Guest Mar 25, 2020