4. (a) Suppose that 0 < Xl < 1 and Xn+1 = 1 - VI - Xn...

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4.

(a) Suppose that 0 < Xl < 1 and Xn+1 = 1 - VI - Xn for n E N. Prove that o < Xn+ 1 < Xn < 1 holds for all n EN.

(b) Suppose that Xl ;::: 2 and Xn+l = 1 + VXn - 1 for n E N. Prove that 2 ~ xn+1 ~ Xn ~ Xl holds for all n E N.

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