Trigonometry: A Very Short Introduction

The Doctrine of Triangles: A History of Modern Trigonometry

Heavenly Mathematics: The Forgotten Art of Spherical Trigonometry

The Mathematics of the Heavens and the Earth: The Early History of Trigonometry

From Samarqand to Jaipur: Evolving al-Kāshī’s Approximation to the Sine of One Degree