Question: Using the proof of Theorem 7.58, prove that (20) holds if r/2 replaces r. Use part a) to estimate the difference |4 - |, where

Using the proof of Theorem 7.58, prove that (20) holds if r/2 replaces r.
Use part a) to estimate the difference |π4 - π|, where x0 = 3, f(x) = sin x, and xn is defined by (19). Evaluate x4 directly, and verify that x4 is actually closer than the theory predicts.

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