// Method :
//	Based on
//	        acosh(x) = log [ x + sqrt(x*x-1) ]
//	we have
//	        acosh(x) := log(x)+ln2,	if x is large; else
//	        acosh(x) := log(2x-1/(sqrt(x*x-1)+x)) if x>2; else
//	        acosh(x) := log1p(t+sqrt(2.0*t+t*t)); where t=x-1.
//
// Special cases:
//	acosh(x) is NaN with signal if x<1.
//	acosh(NaN) is NaN without signal.
//

// Acosh returns the inverse hyperbolic cosine of x.
//

package math

// Export internal functions and variable for testing.
var Log10NoVec = log10
var CosNoVec = cos
var CoshNoVec = cosh
var SinNoVec = sin
var SinhNoVec = sinh
var TanhNoVec = tanh
var Log1pNovec = log1p
var AtanhNovec = atanh
var AcosNovec = acos
var AcoshNovec = acosh
var AsinNovec = asin
var AsinhNovec = asinh
var ErfNovec = erf
var ErfcNovec = erfc
var AtanNovec = atan
var Atan2Novec = atan2

			continue
		}
		// Acosh(Conj(z))  == Conj(Acosh(z))
		if f := Acosh(Conj(v.in)); !cAlike(Conj(v.want), f) && !cAlike(v.in, Conj(v.in)) {
			t.Errorf("Acosh(%g) = %g, want %g", Conj(v.in), f, Conj(v.want))
		}

	}
	for _, pt := range branchPoints {
		if f0, f1 := Acosh(pt[0]), Acosh(pt[1]); !cVeryclose(f0, f1) {
			t.Errorf("Acosh(%g) not continuous, got %g want %g", pt[0], f0, f1)
		}
	}
}

DATA ·acoshtab2068<> + 120(SB)/8, $0.469505379381388441E-01
GLOBL ·acoshtab2068<> + 0(SB), RODATA, $128

// Acosh returns the inverse hyperbolic cosine of the argument.
//
// Special cases are:
//      Acosh(+Inf) = +Inf
//      Acosh(x) = NaN if x < 1
//      Acosh(NaN) = NaN
// The algorithm used is minimax polynomial approximation
// with coefficients determined with a Remez exchange algorithm.

	}
	for i := 0; i < len(vf); i++ {
		a := 1 + Abs(vf[i])
		if f := AcoshNovec(a); !veryclose(acosh[i], f) {
			t.Errorf("Acosh(%g) = %g, want %g", a, f, acosh[i])
		}
	}
	for i := 0; i < len(vfacoshSC); i++ {
		if f := AcoshNovec(vfacoshSC[i]); !alike(acoshSC[i], f) {
			t.Errorf("Acosh(%g) = %g, want %g", vfacoshSC[i], f, acoshSC[i])
		}
	}
}

func TestAsinhNovec(t *testing.T) {

        break;
      case SINH:
        y = Sinh(scope_, x);
        break;
      case COSH:
        y = Cosh(scope_, x);
        break;
      case TANH:
        y = Tanh(scope_, x);
        break;
      case ASINH:
        y = Asinh(scope_, x);
        break;
      case ACOSH:
        y = Acosh(scope_, x);
        break;
      case ATANH:
        y = Atanh(scope_, x);
        break;

// license that can be found in the LICENSE file.

package math_test

import (
	"fmt"
	"math"
)

func ExampleAcos() {
	fmt.Printf("%.2f", math.Acos(1))
	// Output: 0.00
}

func ExampleAcosh() {
	fmt.Printf("%.2f", math.Acosh(1))
	// Output: 0.00
}

func ExampleAsin() {
	fmt.Printf("%.2f", math.Asin(0))
	// Output: 0.00
}

func ExampleAsinh() {
	fmt.Printf("%.2f", math.Asinh(0))

// Acos returns the inverse cosine of x.
func Acos(x complex128) complex128 {
	w := Asin(x)
	return complex(math.Pi/2-real(w), -imag(w))
}

// Acosh returns the inverse hyperbolic cosine of x.
func Acosh(x complex128) complex128 {
	if x == 0 {
		return complex(0, math.Copysign(math.Pi/2, imag(x)))
	}
	w := Acos(x)
	if imag(w) <= 0 {

TEXT ·acoshTrampolineSetup(SB), NOSPLIT, $0
	MOVB   ·hasVX(SB), R1
	CMPBEQ R1, $1, vectorimpl                 // vectorfacility = 1, vector supported
	MOVD   $·acoshvectorfacility+0x00(SB), R1
	MOVD   $·acosh(SB), R2
	MOVD   R2, 0(R1)
	BR     ·acosh(SB)

vectorimpl:
	MOVD $·acoshvectorfacility+0x00(SB), R1
	MOVD $·acoshAsm(SB), R2
	MOVD R2, 0(R1)
	BR   ·acoshAsm(SB)

GLOBL ·acoshvectorfacility+0x00(SB), NOPTR, $8

		a := 1 + Abs(vf[i])
		if f := Acosh(a); !veryclose(acosh[i], f) {
			t.Errorf("Acosh(%g) = %g, want %g", a, f, acosh[i])
		}
	}
	for i := 0; i < len(vfacoshSC); i++ {
		if f := Acosh(vfacoshSC[i]); !alike(acoshSC[i], f) {
			t.Errorf("Acosh(%g) = %g, want %g", vfacoshSC[i], f, acoshSC[i])
		}
	}
}

func TestAsin(t *testing.T) {
	for i := 0; i < len(vf); i++ {
		a := vf[i] / 10