# How calculators calculate inverse trigonometric functions

## Trigonometric functions

Trigonometric functions are elementary functions that calculate the angles of triangles based on the lengths of the sides of triangles. They are also called circular functions (see picture).

The trigonometric functions are:**sin** - Sine**cos** - cosine**daily** - tangent**ctg** - cotangent**sec** - secans**cosec** - cosecans**versin** - sine versus**vercos** - cosine versus**haversin** - Semiversus**exsec** - Exsecans**excsc** - Excosecans

To calculate these functions, just put the angle value into that *angle* Field and you will get a table of results. Angles can be entered in degrees, radians, gradients, minutes, or seconds.

Here are some theories from school:**Sine** of an angle (sin) is the ratio of the length of the opposite side to the length of the hypotenuse.

**cosine** of an angle (cos) is the ratio of the length of the adjacent side to the length of the hypotenuse.

All other functions are represented using the sine and cosine as follows:

Tangent:

(the ratio of the length of the opposite side to the length of the adjacent side)

Cotangent:

(the ratio of the length of the adjacent side to the length of the opposite side)

Secans:

(the ratio of the hypotenuse to the length of the adjacent side)

Cosecant:

(the ratio of the hypotenuse to the length of the opposite side)

Other trigonometric functions:

Sine versus:

Cosine Versus:

Semiversus:

Exsekans:

Excosecans:

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