Given w f(z,y, 2) = zy²z. Find: Ograd/(1,3,-2) 3. (b) equation of the tangent plane to the surface zys = 12 at the point (1,3, -2). (c) directional derivative f-(1,3, -2) in the direction of a unit vector making angle of 60" with grad f(1, 3, -2).

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