A generalized series expansion of the arctangent function based on the enhanced midpoint integration

Sanjar M. Abrarov; Rehan Siddiqui; Rajinder K. Jagpal; Brendan M. Quine

doi:10.3390/appliedmath3020020

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arXiv · 2302.01911

A generalized series expansion of the arctangent function based on the enhanced midpoint integration

Sanjar M. Abrarov·Rehan Siddiqui·Rajinder K. Jagpal·Brendan M. Quine

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Abstract

In this work we derive a generalized series expansion of the acrtangent function by using the enhanced midpoint integration (EMI). Algorithmic implementation of the generalized series expansion utilizes two-step iteration without surd and complex numbers. The computational test we performed reveals that such a generalization improves accuracy in computation of the arctangent function by many orders of the magnitude with increasing integer $M$, associated with subintervals in the EMI formula. The generalized series expansion may be promising for practical applications. It may be particularly useful in practical tasks, where extensive computations with arbitrary precision floating points are needed. The algorithmic implementation of the generalized series expansion of the arctangent function shows a rapid convergence rate in the computation of digits of $\pi$ in the Machin-like formulas.

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Sanjar M. Abrarov, Rehan Siddiqui, Rajinder K. Jagpal, Brendan M. Quine. 2023-01-18. A generalized series expansion of the arctangent function based on the enhanced midpoint integration. https://doi.org/10.3390/appliedmath3020020

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