sema-docs 1.20.2

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

Inverse tangent. Returns radians.

```sema
(math/atan 1)      ; => ~0.7854 (π/4)
(math/atan 0)      ; => 0.0
```