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**COS(**//radians//**)**

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| **COS** | Returns cosine. |
| //radians// | A numeric constant, variable or expression for the angle in radians. p is a constant which represents the ratio of the circumference and radius of a circle. There are 2p radians (or 360 degrees) in a circle. |

The **COS** procedure returns the trigonometric cosine of an angle measured in //radians//. The cosine is the ratio of the length of the angle's adjacent side divided by the length of the hypotenuse.

| **Return Data Type:** | REAL |

**Example:**

**PI        EQUATE(3.1415926535898)  !The approx. value of PI**

**Rad2Deg   EQUATE(57.295779513082)  !Number of degrees in a radian**

**Deg2Rad   EQUATE(0.0174532925199)  !Number of radians in a degree**

** CODE**

** Angle = 45 * Deg2Rad              !Translate 45 degrees to Radians**

** CosineAngle = ****COS****(Angle)          !Get the cosine of 45 degree angle**

**See Also:**

[[tan  return tangent .htm|TAN]]

[[atan  return arctangent .htm|ATAN]]

[[sin  return sine .htm|SIN]]

[[asin  return arcsine .htm|ASIN]]

[[acos  return arccosine .htm|ACOS]]