ACOS

Returns the arccosine, or inverse cosine, of the specified number. The arccosine is the angle whose cosine is the specified number. The returned angle is given in radians in the range [0…π].

Syntax

ACOS( Number n ) → Number

Parameters

n

Required. A number representing a cosine, in the range [-1…1].

Remarks

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

Example

Formula

=ACOS(0.5)
=ACOS(0.5)*180/PI()

See Also

Function Reference
COS Function
PI Function
RADIANS Function
DEGREES Function