// 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"math"// Rect returns the complex number x with polar coordinates r, θ.funcRect(r, θ float64) complex128 {
s, c := math.Sincos(θ)returncomplex(r*c, r*s)}