(a) Find an equation of the tangent plane to the surface at the given point. x2 + y2 + z2 = 19, (1, 3, 3) (b) Find a set of symmetric equations for the normal line to the surface at the given point. X - 1 19 у - 3. 19 Z- 3 19 X - 1 1 y - 3 3 Z- 3 3 %3D 19 19 19 Ox - 1 = y - 3 = z - 3 O X = L = Z 13

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