Trigonometric tables provide the numerical values for the fundamental trigonometric functions of angles, such as the cosine of 30° or the sine of 60°. The tables are usually arranged with the angles listed in degrees (or sexagesimal numeration) and radians. The intersection of a function name with the angle provides the numerical value.

Many sources provide a trigonometric table for every whole number angle from 0 to 90° (or 0 to /2 radians). In these tables the angles from 0 to 45° are listed in the left-hand column and are used with the functions listed across the top row. The angles from 45 to 90° are listed in the right-hand column in descending order and are used with the functions listed across the bottom row. Here is an excerpt from such a table:

From this table, the sine of 30° is 0.5000. Using the functions listed across the bottom row, the cosine...