atan(_:) Returns the arctangent of each element in a vector. Declarationfunc atan(_ x: simd_double2) -> simd_double2 See AlsoTrigonometric Functionsacos(_:)asin(_:)atan2(_:_:)cos(_:)cospi(_:)sin(_:)sinpi(_:)sincos(_:)sincospi(_:)tan(_:)tanpi(_:)