And so we get this is equal to, let me do it in that same blue color, it's equal to, so this is just simplified, this is just 0 right over here. This is 1 squared over 2, which is just 1 half. So it's just pi over 2, 1 half times pi minus, well this is just 0, this is 1 third minus pi over 3. Minus pi over 3 and then to simplify this it's just really subtracting fractions. So we can find a common denominator. Common denominator is 6. This is going to be 3 pi over 6.