sema-docs 1.25.0

Canonical structured documentation for Sema builtins/special forms; powers LSP hover/completion and REPL apropos
Documentation 
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---
name: "math/acos"
module: "math"
section: "Trigonometry"
---

Inverse cosine. Returns radians.

```sema
(math/acos 0)      ; => ~1.5707 (π/2)
(math/acos 1)      ; => 0.0
```