i.8.13 Surface integrals

condition: Write double integrals \[ \iint_{S} P(x, y, z) d y d z+R(x, y, z) d x d y \] where \( S- \) part of the cone \( z^{2}=x^{2}+y^{2} \) for \( y \leq 0,0 \leq z \leq 3 \) Coordinates of the normal vector at the point \( (0 ;-1 ; 1) \) of the surface \( -(0 ;-1 ;-1) \).