Function: Acos

Description

Returns the arccosine, also known as inverse cosine, value (in radians) of a given number.

Syntax

Acos(number)

Arguments

Number must be a value between => -1 and =< 1

Return value

This function returns a value in radians.

Calculated field example

Acos returns the following for these values of x:

x	acos(x)
-1.000	π ≈ 3.142
-√3/2 ≈ -0.866	5π/6 ≈ 2.618
-√2/2 ≈ -0.707	3π/4 ≈ 2.356
-1/2 ≈ -0.500	2π/3 ≈ 2.094
0.000	π/2 ≈ 1.571
1/2 = 0.500	π/3 ≈ 1.047
√2/2 ≈ 0.707	π/4 ≈ 0.785
√3/2 ≈ 0.866	π/6 ≈ 0.524
1.000	0.000