Write a function to return the value of Rosenbrock's two-dimensional banana function, as well as it's gradient (column) vector and Hessian matrix, given a vector of it's two independent variables x1 and x2. Here's the Rosenbrock function:

 100*[(x2-x1^2)^2] + (1-x1)^2

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Last Solution submitted on Feb 15, 2026

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