Let z = g(x, y) = f(3 cos(xy), y + e=") provided that f(3, 5) = 6, f1(3,5) = 2, f2(3, 5) = 6. i) Find g1 (0, 4). ii) Find g2 (0, 4). iii) Find the equation of the tangent plane to the surface z = f(3 cos(ry), y + e™Y) at the point (0, 4).

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