8. Determine all analytic functions of the form f(2)= a₁ + a₂y + azz² + aszy+asy² +a6x³ + a7y³, where a₁,..., a7 € C. 9. Determine the analytic functions f = u + iv, for which u(x, y) = x³ + xg(y), where g is a twice continuously differentiable function.

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