Find an upper bound for the magnitude |E| of the error in the linear approximation L to f at the given point over the given region.
at 
R: |x| ? 0.1, |y| ? 0.1, |z| ? 0.1
A. |E| ? 16.816
B. |E| ? 14.714
C. |E| ? 15.765
D. |E| ? 18.2173
Answer: C
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