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Abstract

In the article, we present several sharp upper and lower bounds for the complete elliptic integral of the first kind in terms of inverse trigonometric and inverse hyperbolic functions. As consequences, some sharp bounds for the Gaussian arithmetic-geometric mean in terms of other bivariate means are also given.

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Acknowledgements

This work was supported by the Natural Science Foundation of China (Grant Nos. 61673169, 11301127, 11701176, 11626101, 11601485) and the Key Project of the Scientific Research of Zhejiang Open University in 2019 (Grant no. XKT-19Z02).

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Qian, WM., He, ZY. & Chu, YM. Approximation for the complete elliptic integral of the first kind. RACSAM 114, 57 (2020). https://doi.org/10.1007/s13398-020-00784-9

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