Function acos() calculates the radian of a cosine value.

Arguments：

• Cosine <number>, ∈ [-1, 1]

Returns：

• Radian <number>, ∈ [-PI/2, PI/2]

Common Usage

Example: Calculate the radian of cosine value 0.5

return acos(0.5) * 180 / pi()

60

Example: Calculate the radian of each row (cosine value) of an alias

uncollect [1, -0.5, 0] as a
return acos(a)

0
2.0943951023932
1.5707963267949