Compute The Three Dimensional Chebyshev Polynomial Tensor Product Approximation

Compute the three-dimensional Chebyshev polynomial tensor product approximation on [1, 3] using 11 points in each dimension. Use 41 uniformly distributed points in each dimension to compute the L and L norms of the error. Then compute the complete polynomial approximation. How much accuracy do you lose? What is the relative computational cost of the two approximations?

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