acos¶ Syntax¶ acos(x) Parameters¶ x a numeric expression. Returns¶ The arc cosine of x. The result is in the closed interval [0, π]. Description¶ This action calculates the arc cosine, or inverse cosine, of the given value. Examples¶ my_numeric = acos(some_number) See Also¶ acos acosh asin asinh atan.md atan2 atanh cos cosh sin sinh tan tanh