Calculate arc cosine of a value in R programming – acos() function Last Updated : 10 May, 2020 Improve Improve Like Article Like Save Share Report The acos() is an inbuilt function in R Programming which is used to calculate arc cosine of the specified radian value and output is also in radians. Syntax: acos(radian) Return: Returns the arc cosine value of radian. Example 1: # Using acos() method gfg <- acos(pi/4) print(gfg) Output: [1] 0.7853982 Example 2: # Using acos() method gfg <- acos(pi/6) print(gfg) Output: [1] 1.019727 Like Article Suggest improvement Next Calculate Inverse cosine of a value in R Programming - acos() Function Share your thoughts in the comments Add Your Comment Please Login to comment...