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Correct solutions were received from: N. Curwen, S. Dolan, R. Gordon, M. Hennings, G. Howlett, G. & N. Jameson, P. Kitchenside, J. A. Mundie, P. Pandey, C. Starr, R. Summerson and the proposer Seán Stewart.
References
1
Jameson, G. J. O., Sine, cosine and exponential integrals, Math. Gaz. 99 (July 2015) pp. 276–289.10.1017/mag.2015.36CrossRefGoogle Scholar