146. A recursive definition of ¤/2 If you start with x1 = 1 and define the subsequent terms of {xn} + cos x„-1, you generate a sequence that converges by the rule Xn Xn-1 rapidly to /2. (a) Try it. (b) Use the accompanying figure to explain why the convergence is so rapid. y cos Xn – 1 Xn – 1 Xn - 1

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