Three is the same thing as 12 over four. 12 over four plus 1 4th is 13 4ths. So you have 13 4ths minus two cosine, two cosine of negative one. Minus e to the negative four over four. And then of course you have your 1 1.5 sitting out here. And it's not the most beautiful or simple thing, but this is our answer. This is the average value of f of x over that interval.