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Source file src/math/copysign.go

  // 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 math
  
  // Copysign returns a value with the magnitude
  // of x and the sign of y.
  func Copysign(x, y float64) float64 {
  	const sign = 1 << 63
  	return Float64frombits(Float64bits(x)&^sign | Float64bits(y)&sign)
  }
  

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