dborges3061 dborges3061 07-06-2023 Mathematics contestada In Problems 1-3, find the tangent plane to the surface at point P 0 . 1. z=x 2 +xy+y 2 ,P 0 (−1,1,1) 2. z=x 2 y+e xy siny,P 0 (1,0,0) 3. z= y x +xy,P 0 (4,1,8)