Reference Manual Owner's manual

Publication GMLC-5.2 - November 1999

643

The argument may be any floating point value or expression. The value of

the Arc_tangent function is always an angle from -π/

to π/

radians

(±90°), inclusive.

For example, the following expression is evaluated as 0.7853xx since the

principal angle whose tangent is 1 is 0.7853 radians (45°).

Arc_tangent(1)

To convert the value of the Arc_tangent function to degrees, multiply by

180

/π. For example, the following expression is evaluated as 45 (assuming

the user constant Pi has been defined as the value of π) since the

principal angle whose tangent is 1 is 45°.

Arc_tangent(1) * 180 / Pi)

Cosine

The value of the Cosine function is the cosine of the argument angle (in

radians), as shown below.

Argument–

–

−

+π