Approximate f by a taylor polynomial with degree n at the number a.
t3(x) = 1+ (x−1) 7− 6(x−1)2 98+ 78(x−1)3 2058

(b) use taylor's inequality to estimate the accuracy of the approximation f(x) ≈ tn(x) when x lies in the given interval. (round your answer to eight decimal places.)

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