integral integral integral(x^2 + y^2 + z^2) dx dy dz = c_1 x y + c_2 x + c_3 + 1/3 x^3 y z + 1/3 x y z (y^2 + z^2)

integral_(-L)^L integral_(-L)^L integral_(-L)^L (x^2 + y^2 + z^2) dx dy dz = 8 L^5

integral integral integral_(x^2 + y^2 + z^2