9.8.1 Surface integrals

3) Problem: Calculate the surface integral of the first kind of the function \( \vec{F} \) over the surface \( S \), where \[ \begin{array}{l} \vec{F}(x, y, z)=\left\{y^{2}-z^{2}, z^{2}-x^{2}, x^{2}-y^{2}\right\}, \\ S:\left\{\begin{array}{c} 0 \leq x \leq 4,0 \leq y \leq 4,0 \leq z \leq 4 \\ x+y+z=6 \end{array}\right. \end{array} \]