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I got part 5a and c wrong. Need help with those 2 parts.

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5. (a) What is the third order Taylor polynomial of arctan(x) with base point a = 1 ?
(b) Estimate arctan(.99) using T3.
(c) Find an upper bound for the error. (Hint: Consider graphing the fourth derivative
of arctan(x) in a neighborhood of 1 on a computer.)

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