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| | Indexes | Syntax | >> Prelude << | Ratio | Complex | Numeric | Ix | Array | List | Maybe | Char | Monad | IO | Directory | System | Time | Locale | CPUTime | Random |
| 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 |
Input: acos (pi/4)
Output: 0.667457