# Trigonometric functions #

All of the functions in this section either take an angle as an argument or return one as a result\.

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CLEM trigonometric functions  

Table 1\. CLEM trigonometric functions

| Function                | Result | Description                                                                                                                                                                                                                   |
| ----------------------- | ------ | ----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |
| `arccos(NUM)`           | *Real* | Computes the arccosine of the specified angle\.                                                                                                                                                                               |
| `arccosh(NUM)`          | *Real* | Computes the hyperbolic arccosine of the specified angle\.                                                                                                                                                                    |
| `arcsin(NUM)`           | *Real* | Computes the arcsine of the specified angle\.                                                                                                                                                                                 |
| `arcsinh(NUM)`          | *Real* | Computes the hyperbolic arcsine of the specified angle\.                                                                                                                                                                      |
| `arctan(NUM)`           | *Real* | Computes the arctangent of the specified angle\.                                                                                                                                                                              |
| `arctan2(NUM_Y, NUM_X)` | *Real* | Computes the arctangent of `NUM_Y / NUM_X` and uses the signs of the two numbers to derive quadrant information\. The result is a real in the range `- pi < ANGLE <= pi (radians) – 180 < ANGLE <= 180 (degrees)` |
| `arctanh(NUM)`          | *Real* | Computes the hyperbolic arctangent of the specified angle\.                                                                                                                                                                   |
| `cos(NUM)`              | *Real* | Computes the cosine of the specified angle\.                                                                                                                                                                                  |
| `cosh(NUM)`             | *Real* | Computes the hyperbolic cosine of the specified angle\.                                                                                                                                                                       |
| `pi`                    | *Real* | This constant is the best real approximation to pi\.                                                                                                                                                                          |
| `sin(NUM)`              | *Real* | Computes the sine of the specified angle\.                                                                                                                                                                                    |
| `sinh(NUM)`             | *Real* | Computes the hyperbolic sine of the specified angle\.                                                                                                                                                                         |
| `tan(NUM)`              | *Real* | Computes the tangent of the specified angle\.                                                                                                                                                                                 |
| `tanh(NUM)`             | *Real* | Computes the hyperbolic tangent of the specified angle\.                                                                                                                                                                      |

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