Suggested Reading
Eli Maor,The Story of a Number, Universities Press, 1999.
Eli Maor,Trigonometric Delights, Universities Press, 2000.
Shailesh Shirali,A Primer on Logarithms, Universities Press, 2002.
BC Das and BN Mukherjee,Higher Trigonometry, UN Dhur & Sons Pvt. Ltd, 1996.
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Mukhopadhyay, U. Some interesting features of hyperbolic functions. Reson 11, 81–85 (2006). https://doi.org/10.1007/BF02855783
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DOI: https://doi.org/10.1007/BF02855783