On medieval Kerala mathematics

@article{Rajagopal1986OnMK,
  title={On medieval Kerala mathematics},
  author={C. T. Rajagopal and Mythili Rangachari},
  journal={Archive for History of Exact Sciences},
  year={1986},
  volume={35},
  pages={91-99}
}
The two latter series are also found stated in the Tantrasangraha in the related forms 1 ίπ'2 s3 1 /π'4^5 [Β,] rsine = 5__|_j_ ίπ'2 + _y /π'4^5 __..., and 1 ίπ' s2 1 /π'3 sA M 'COs9 = '-2!(t)t+4!(t) 1 ίπ' 1 /π'3 ?--> where, in a circle of radius r, the angle 0 is understood to be subtended at the centre by an arc s ^ c = ' nr. Furthermore, the Tantrasangraha announces the three approximations (to the length of the quadrant of unit diameter) 
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12 Citations

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References

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On an untapped source of medieval Keralese mathematics
Presentation d'un manuscrit sanskrit de l'ecole medievale du Kerala (Inde), redige par un eleve de Jyesthadeva, auteur du texte Yukti-bhasa (16 siecle) et reprenant les developpements en serie de…
Vorlesungen über geschichte der mathematik
e Darstellung der Regeln seine Zuhörer entmuthigte , die sich bis auf zwei , unter welchen Polack war , in den ersten sechs Wochen verliefen , ehe Hermann noch die Hälfte der Geometrie abgehandelt…
XXXIII. On the Hindú Quadrature of the Circle, and the infinite Series of the proportion of the circumference to the diameter exhibited in the four S'ástras, the Tantra Sangraham, Yucti Bháshá, Carana Padhati, and Sadratnamála