Find an upper bound for the magnitude |E| of the error in the approximation f(x, y) ? L(x, y) at the given point over the given region R.
at 
; R: |x| ? 0.1, |y| ? 0.1, |z| ? 0.1
A. |E| ? 25.4811
B. |E| ? 23.521
C. |E| ? 20.5809
D. |E| ? 22.051
Answer: D
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