Basic Trigonometry Functions
PHP supports the basic set of trigonometry functions and are listed in Table 2-4.
Table 2-4. Trigonometry functions supported by PHP
| Function | Description |
|---|---|
| float sin(float arg) | Sine of arg in radians |
| float cos(float arg) | Cosine of arg in radians |
| float tan(float arg) | Tangent of arg in radians |
| float asin(float arg) | Arc sine of arg in radians |
| float acos(float arg) | Arc cosine of arg in radians |
| float atan(float arg) | Arc tangent of arg in radians |
| float atan2(float y, float x) | Arc tangent of x/y where the sign of both arguments determines the quadrant of the result |
| float pi( ) | Returns the value 3.1415926535898 |
| float deg2rad(float arg) | Converts arg degrees to radians |
| float rad2deg(float arg) | Converts arg radians to degrees |