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The asymptotic order of convergence of Brent's method tends to be either 1.618 and 1.689, of which the Alefeld-Potra-Shi's methods lie directly in between. The main difference of the Alefeld-Potra-Shi's methods are the tightness of the bounds, which Brent's method may fail to give during intermediate iterations. Overall, I do not recommend Alefeld-Potra-Shi'...

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