G of x is x, that squared is x squared, and then we multiply times dx. So this is going to be equal to, we can factor out the pi, zero to one, x minus x squared dx, which is equal to pi times, let's see, the antiderivative of x is x squared over two, antiderivative of x squared is x squared over three, x to the third over three, and we're going to evaluate this from zero to one. So this is going to be equal to, I'm running out of my real estate a little bit, let me scroll over to the right a little bit. So this is going to be equal to pi times, well, when you evaluate this whole thing at one, you get, let's see, you get one half minus one third, one half minus one third, and then you subtract it, evaluate it at zero, but that's just going to be zero. Zero squared over two minus zero to the third power over three, that's just all going to be zero. So when you subtract out zero, you're just left with this expression right over here. What's one half minus one third?