3.4․19 Tangents and Normals

Condition: find the equation of the tangent plane and normal to the surface \ (s \) at the point \ (m_ {0} (1.2, -3) \) \ [s: x^{2}+z {2} -5 y z+3 y = 46, \ quad m_ {0} (1.2, -3) \ text {. } \]