# acos() math function in python by R4R Team

- acos() is python math function which determine the arc cosine value of number in radians

Syntax-

math.acos(x)

- Here x should be a numeric value between -1 and 1.
- it return the arc of cosine of x in radians.

Example-

acos(1) will return 0.0
acos(0.5) will 1.0471975511965979

program-

import math

print("acos(1) : ",math.acos(1))
print("acos(0.34) : ",math.acos(0.34))
print("acos(0.5) : ",math.acos(0.5))
print("acos(-0.49) : ",math.acos(-0.49))
print("acos(0) : ",math.acos(0))

output-

acos(1) : 0.0
acos(0.34) : 1.2238794292677349
acos(0.5) : 1.0471975511965979
acos(-0.49) : 2.0828860797290445
acos(0) : 1.5707963267948966

-If we want to print the arc cosine value of x in degree then-

program-

import math

#these value are in degrees
n=180/math.pi
print("acos(1) : ",math.acos(1)*n)
print("acos(0.34) : ",math.acos(0.34)*n)
print("acos(0.5) : ",math.acos(0.5)*n)
print("acos(-0.49) : ",math.acos(-0.49)*n)
print("acos(0) : ",math.acos(0)*n)

output-

acos(1) : 0.0
acos(0.34) : 70.12312592992117
acos(0.5) : 60.00000000000001
acos(-0.49) : 119.34058157502375
acos(0) : 90.0