∫∫e^(x^2)dxdy = ∫ e^(x^2)dx y = ∫ e^(x^2) (x - x^3) dx =1/2 ∫ e^(x^2) (1 - x^2) dx^2
= 1/2∫ e^t(1-t)dt = (2-t)e^t = e - 2请问(x-x`3)如何得来的对y积分，上下限为x和x^3