cospi(_:) Returns the cosine of each element in a vector multiplied by pi. Declarationfunc cospi(_ x: simd_double4) -> simd_double4 See AlsoTrigonometric Functionsacos(_:)asin(_:)atan(_:)atan2(_:_:)cos(_:)sin(_:)sinpi(_:)sincos(_:)sincospi(_:)tan(_:)tanpi(_:)