I'm going to divide it by 4, so negative 2x to the fourth power. And all I did is I incremented the 3 to a 4, and then I divided the 8 by the 4. And you could take the derivative of this to verify that it is the same thing as negative 8x to the third power. And we're going to have to evaluate that from 0 to 1 half. When you evaluate it 1 half, so I'm going to get negative 1 over pi cosine of pi over 2 minus 2 times 1 half to the fourth power is 1 sixteenth. So that's it evaluated at 1 half. And then from that I'm going to subtract negative 1 over pi cosine of 0.