Question

what is ∫∫x dx dx

Answer 1

Indefinite integral would be c1x+c2+(x^3)/6
I think.

Answer 2

(∫x^2 dx) /2
(x^3)/6

Answer 3

∫∫x dx dx
∫(∫x dx )dx
=∫(1/2x^2+c1) dx
= 1/6 x^3+c1x+c2