Chapter 1, Problem 6RE

Short answer exercises: Exercises 1-10 focus on the basic ideas, definitions, and vocabulary of this chapter. Their answers arc short (a single sentence or drawing), and you should be able to do them with little or no computation. However, they vary in difficulty, so think carefully before you answer.
6. Sketch the phase line for the autonomous equation $dy/dt={\sin }^{2}y$ .