You are given that the function f (x, y, z) = ax² + b(y² + z²) + cxy + dxz, a, b, c, d E R 6. has a critical point at (xo, Yo, 20) simultaneously equal to zero, classify the critical point (0,0,0) of f(x, y, z). (0,0, 0). Assuming a × b > 0 and c,d not

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