---
title: "cos(_:)"
framework: simd
role: symbol
role_heading: Function
path: "simd/cos(_:)-9hw4a"
---

# cos(_:)

Returns the cosine of each element in a vector.

## Declaration

```swift
func cos(_ x: simd_double3) -> simd_double3
```

## See Also

### Trigonometric Functions

- [acos(_:)](simd/acos(_:)-76i0e.md)
- [asin(_:)](simd/asin(_:)-g6mp.md)
- [atan(_:)](simd/atan(_:)-2h77h.md)
- [atan2(_:_:)](simd/atan2(_:_:)-1zx4a.md)
- [cospi(_:)](simd/cospi(_:)-471sg.md)
- [sin(_:)](simd/sin(_:)-5dnnn.md)
- [sinpi(_:)](simd/sinpi(_:)-291vx.md)
- [sincos(_:)](simd/sincos(_:)-6572x.md)
- [sincospi(_:)](simd/sincospi(_:)-2t5q7.md)
- [tan(_:)](simd/tan(_:)-2tvur.md)
- [tanpi(_:)](simd/tanpi(_:)-42odv.md)