http://m.wolframalpha.com/input/?i=x%5E%285e%5E%28pi%2F3%29%29-8*%28%28x%5Ez%29*sqrt%285%29%5E%28x*y%29%29*Integrate%5Bx%5E3%5Ey-z%5Ex%2C+%7Bx%2C+9*pi%2C+e*PI%7D%5D
wolframにすら手におえないのか…
http://m.wolframalpha.com/input/?i=x%5E%285e%5E%28pi%2F3%29%29-8*%28%28x%5Ez%29*sqrt%285%29%5E%28x*y%29%29*Integrate%5Bx%5E3%5Ey-z%5Ex%2C+%7Bx%2C+9*pi%2C+e*PI%7D%5D
wolframにすら手におえないのか…