trigonometric ratios are usually defined as the ratio between two sides of a triangle associated with the angles. The trigonometric functions are functions whose values \u200b\u200bare extensions of the concept trigonometric ratio right triangle drawn on a unit circle (radio unit). Modern definitions describe them as infinite series or as the solution of certain differential equations, allowing their extension to positive and negative values, and even complex numbers.
There are six basic trigonometric functions. The last four, are defined in relation to the first two functions, but can be defined geometrically or through their relationships. Some features were common in ancient times, and appear in the first tables, but not currently used, for example, versene (1 - cos θ) and exsecante (sec θ - 1).
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