---
title: cos
framework: Kernel
role: symbol
role_heading: Function
platforms: [macOS 10.10+]
path: kernel/1557361-cos
---

# cos

## Declaration

```occ
double cos(double);
```

## See Also

### Cosine

- [cosf](kernel/1532192-cosf.md)
- [cosh](kernel/1557145-cosh.md)
- [coshf](kernel/1557149-coshf.md)
- [coshl](kernel/1557214-coshl.md)
- [cosl](kernel/1557255-cosl.md)