A surface S is described by the equation f(x, y, z) = n where f(x, y, z) = yz + nx²y+ yz³ 3 (a) Find the equation of the tangent plane to the surface S at the point P(1, 1,0). (b) Find the directional derivative of the function f(x, y, z) at the point P(1,1,0) and in the direction u =ni-j+nk

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