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Find the linear approximation of the function f(x, y, z) = x2 + y2 + z2...

Find the linear approximation of the function f(x, y, z) = x2 + y2 + z2 at (6, 2, 9) and use it to approximate the number 6.012 + 1.972 + 8.982 . (Round your answer to five decimal places.) f(6.01, 1.97, 8.98) ≈

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