---
title: "cos(_:)"
framework: simd
role: symbol
role_heading: Function
path: "simd/cos(_:)-7bqey"
---

# cos(_:)

Returns the cosine of each element in a vector.

## Declaration

```swift
func cos(_ x: simd_double8) -> simd_double8
```

## See Also

### Trigonometric Functions

- [acos(_:)](simd/acos(_:)-2141m.md)
- [asin(_:)](simd/asin(_:)-78d03.md)
- [atan(_:)](simd/atan(_:)-7b52p.md)
- [atan2(_:_:)](simd/atan2(_:_:)-8pfg9.md)
- [cospi(_:)](simd/cospi(_:)-8d55q.md)
- [sin(_:)](simd/sin(_:)-1joh9.md)
- [sinpi(_:)](simd/sinpi(_:)-9tdix.md)
- [sincos(_:)](simd/sincos(_:)-3iwed.md)
- [sincospi(_:)](simd/sincospi(_:)-5yfry.md)
- [tan(_:)](simd/tan(_:)-7a2xj.md)
- [tanpi(_:)](simd/tanpi(_:)-3lobh.md)