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Module: Prelude
Function: acos
Type: Floating a => a -> a
Class: Floating
Description: inverse cosine
Related: acosh, asin, asinh, atan, atanh, cos, cosh, sin, sinh, tan, tanh
Keywords: cosine inverse, trigonometry
MATHWORLD Inverse Cosine

Example 1

Input: acos (pi/4)

Output: 0.667457