Acos function

Contents > Functions reference (alphabetical list) > Trigonometric functions > Acos function

Acos function

Format


Acos (number)

Parameter

number - any numeric expression or field containing a numeric expression in the range -1 to 1.

Data type returned

number

Description

Returns the arccosine, or inverse cosine, of a number. The arccosine is the angle whose cosine is number. The returned angle is given in radians in the range 0 (zero) to Pi. The input number parameter must be between -1 and 1.

If you want to convert the result from radians to degrees, multiply it by 180/Pi or use the Degrees function.

Examples


Acos(-0.5) returns 2.0943951.


Acos(-0.5)*180/Pi returns 120.


Degrees(Acos(-0.5)) returns 120.


Acos(2.0) ? (not a number).

Related topics

Functions reference (category list)

Functions reference (alphabetical list)

About formulas

About functions

Defining calculation fields

Using operators in formulas

Contents > Functions reference (alphabetical list) > Trigonometric functions > Acos function