acos(_:) Returns the arccosine of each element in a vector. Declarationfunc acos(_ x: simd_float4) -> simd_float4 See AlsoTrigonometric Functionsasin(_:)atan(_:)atan2(_:_:)cos(_:)cospi(_:)sin(_:)sinpi(_:)sincos(_:)sincospi(_:)tan(_:)tanpi(_:)