And we know that that's going to be equal to, let's see, y is, when x is negative one, y is one, that sits on this curve. So y is one, so one, over three y squared. So three times one squared, which is three, minus x. When y is one, x is negative one, or when x is negative one, y is one. So x is negative one here. And so this is the same thing as three plus positive one. And so this is equal to 1 4th.