But here you're like, well which case do I use? I don't know if the x that gets us to negative three is going to be less than zero or I don't know if it's going to be greater than zero, so I don't know which case to use. And one thing to realize is to look at these functions a little bit and realize that cosine of x is a bounded function. Cosine of x can only go between positive one and negative one. So negative two cosine of x can only go between positive two and negative two. So this can only go between positive two and negative two. So it can never get to negative three.