$(2)$ Find the volume of the subset $E_{1,2}$ of $R^3$ given by

$E_{1,2}=\{(x,y,z)in{R}^3,\frac{x^2}{4}+\frac{z^2}{9}1,-1y2\}$

Hint: For the second question, integrate the function $1$ on $E_{1,2}$ and use different coordinates for $x$ and $z($equation of an ellipse $...).$