$1.$compute ${\displaystyle \underset{C}{\overset{\phantom{}}{}}}(x^2-y^2)ds,$ where $C$ is the curve made by the intersection of the cylinde $x^2{y}^2=4$ and the plane $xyz=2$ for $z0.$

$2.$Compute the work done by the vector field $F(x,y,z)=x^{2}i{y}^{2}j-z^{2}k$ along the curve $C$ in the question $1.$

I need solution to no$\mathrm{.}2$ only