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 - 1| ? 0.1, |y - 1| ? 0.1, |z - 1| ? 0.1
A. |E| ? 0.21
B. |E| ? 0.188
C. |E| ? 0.225
D. |E| ? 0.175
Answer: C
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