Trigonometric tables

In mathematics, tables of trigonometric functions are useful in a number of areas. Before the existence of pocket calculators, trigonometric tables were essential for navigation, science and engineering. The calculation of mathematical tables was an important area of study, which led to the development of the first mechanical computing devices.

Trigonometric calculations played an important role in the early study of astronomy.
Early tables were constructed by repeatedly applying trigonometric identities to compute new values from old ones.

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Source: Wikipedia · Image: Wikimedia Commons · CC BY-SA 3.0

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Trigonometry that clicks — calculators, identities, and worked explanations for angles and waves.

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