Arccos

The inverse cosine function

fun arccos(number)

Parameters

• number: A dimensionless number value

Discussion

arccos is the inverse of cos so if arccos(number) == x then cos(x) == number. The returned number is in terms of radians:

arccos(1)
arccos(.5)

0 rad
1.05 rad

arccos is valid where -1 <= number <= 1