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6. Consider a function k(x) : R -> R that is twice differentiable everywhere on R. If Vk(xo) # 0 and V2k(To) > 0 at

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6. Consider a function k(x) : R" -> R that is twice differentiable everywhere on R". If Vk(xo) # 0 and V2k(To) > 0 at some point To, what can we assert in this case? A. Co is a local minimum. B. co is a global minimum. C. Co is not a local minimum. D. co is a saddle point

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