I ahve the question $\displaystyle \int\int_D f(x,y) dxdy$, where $\displaystyle f(x,y)=xy^2$ and D is the region in the first quadrant D bounded by the curves $\displaystyle y = x^2$ and $\displaystyle x = y^2$.

And i think im right in saying that this is the same as

$\displaystyle \int^{\sqrt{x}}_{-\sqrt{x}} \int^{\sqrt{y}}_{-\sqrt{y}} xy^2 dxdy$

but when i do the first integral it equals 0 so i dont know what to do with the next