Consider the following function. f(x, y, z) = √√x² + y² + z² Find f (x, y, z), f(x, y, z), and f₂(x, y, z). f(x, y,z) fy(x, y, z) = f₂(x, y, z)= Find the linear approximation of the function f(x, y, z)=√√√x² + y² + z² at (7, 6, 6). f(x, y, z) = Use the linear approximation to approximate the number 7.022 + 5.992 + 5.972. (Round your answer to four decimal places.) f(7.02, 5.99, 5.97) =

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