sema-docs 1.20.3

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

Cosine (argument in radians).

```sema
(cos 0)       ; => 1.0
(cos pi)      ; => -1.0
```