So all of that is negative 1 1 2. But then we're subtracting negative 1 1 2. Zero minus negative 1 1 2 is going to be equal to positive 1 1 2. So this is going to be equal to positive 1 1 2. So this first part right over here is positive 1 1 2. And now let's evaluate the integral from zero to one of cosine pi, I don't need that first parenthesis, of cosine of pi x dx. What is this equal to?