Salina, Tamara, and Traci are working on their homework together. Salina tells her friends that she got θ = 52° for the inverse cosine problem she is working on and asks if they got the same answer. Tamara says she got θ = 128 °, and Traci volunteers her answer of θ = 308 °. Is it possible that these are all solutions to the same problem? Justify your answer. Homework Help ✎
What is the cosine of each angle?