Python acos

Python acos(x) method return the arccosine value of x[-1,1], in radians. 

>>> import math
>>> math.acos(0.5)

1.0471975511965979

>>> math.acos(-1)

3.141592653589793

>>> math.acos(0)

1.5707963267948966

y=arccos(x) Graph

Y
(Degrees) 		Y
(Radian) 		X
180 ̊ π -1
150 ̊ 5π/6 -0.866025
135 ̊ 3π/4 -0.707107
120 ̊ 2π/3 -0.5
90 ̊ π/2 0
60 ̊ π/3 0.5
45 ̊ π/4 0.707107
30 ̊ π/6 0.866025
0 ̊ 0 1

Arccos Functions
1. arccos(-x) = π - arccos(x);
2. arccos(x) + arcsin(x) = π/2;

Arccose function is the inverse of cosine, arccose(x)=cos-1(x). The principle values for x is [-1,1].
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