// Copyright 2010 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.

package cmplx

import 

// Phase returns the phase (also called the argument) of x.
// The returned value is in the range [-Pi, Pi].
func ( complex128) float64 { return math.Atan2(imag(), real()) }