There are two of them that I can't figure out:

1. $\displaystyle \int^2_0\int^{\frac{\pi}{2}}_0 x\sin{y} \ dydx$

On this one I got 0, but it's supposed to be 2

And

2. $\displaystyle \int^2_0\int^1_0 (2x + y)^8 \ dxdy$

On this one I got $\displaystyle \frac{262144}{45}$ but its supposed to be $\displaystyle \frac{261632}{45}$. My answer is $\displaystyle 2^9$ off.

Any help is appreciated.