Consider the following function. f(x, y, z)= sqrt x2+ y2+ z2 Find fx(x, y, z), fy(x, y, z), and fz(x, y, z). fx(x, y, z)= fy(x, y, z)= fz(x, y, z)= Find the linear approximation of the function f(x, y, z)= x2+ y2+ z2 at (2,9,6). f(x, y, z) Use the linear approximation to approximate the number 2.032+8.982+5.992.(Round your answer to four decimal places.) f(2.03,8.98,5.99)