That's just going to be equal to x. We're going to evaluate this from 1 to 4. We're in the home stretch. This is going to be equal to pi times, first let's do it at 4. See if 4 squared, I'll write it all out, is 1 squared over 2 minus 4 to the 3, let me do this part first, minus 4 thirds, 4 thirds, and that was 4 to the 3 halves. 4 to the 1 half is 2, and then you raise that to the 3rd power, you get 8. Times 8 plus 4, and then you subtract out all of this stuff evaluated at 1.