Uso Taylor's formula to find a quadratic approximation of (x y) = 9 cos x cos y at the origin. Estimate the error in the approximation il k| s 0 07...

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Uso Taylor's formula to find a quadratic approximation of (x y) = 9 cos x cos y at the origin. Estimate the error in the approximation il k| s 0 07 and M s 0.12Find a quadratic approximation of Nx y) . 9eos s cos y al thio origin