Let z = g(z, y) = f(3 cos(ry), y + e") provided that f(3, 7) = 4, fi(3, 7) = 2, f2(3, 7) = 3. i) Find g1 (0, 6). ii) Find 92 (0, 6). iii) Find the equation of the tangent plane to the surface z = f(3 cos(ry),y + etv) at the point (0, 6).

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