// 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.
//

// 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))

}

// Complex hyperbolic cosine
//
// DESCRIPTION:
//
// ccosh(z) = cosh x  cos y + i sinh x sin y .
//
// ACCURACY:
//
//                      Relative error:
// arithmetic   domain     # trials      peak         rms
//    IEEE      -10,+10     30000       2.9e-16     8.1e-17

// Cosh returns the hyperbolic cosine of x.
func Cosh(x complex128) complex128 {
	switch re, im := real(x), imag(x); {

	}

	if sign {
		temp = -temp
	}
	return temp
}

// Cosh returns the hyperbolic cosine of x.
//
// Special cases are:
//
//	Cosh(±0) = 1
//	Cosh(±Inf) = +Inf
//	Cosh(NaN) = NaN
func Cosh(x float64) float64 {
	if haveArchCosh {
		return archCosh(x)
	}
	return cosh(x)
}

func cosh(x float64) float64 {
	x = Abs(x)
	if x > 21 {
		return Exp(x) * 0.5
	}
	ex := Exp(x)

		temp = satan(x / temp)
	}

	if sign {
		temp = -temp
	}
	return temp
}

// Acos returns the arccosine, in radians, of x.
//
// Special case is:
//
//	Acos(x) = NaN if x < -1 or x > 1
func Acos(x float64) float64 {
	if haveArchAcos {
		return archAcos(x)
	}
	return acos(x)
}

func acos(x float64) float64 {
	return Pi/2 - Asin(x)

static constexpr char kMlirModuleStr[] = R"(
  module attributes {tf.versions = {bad_consumers = [], min_consumer = 0 : i32, producer = 268 : i32}} {
  func.func @main(%arg0 : tensor<1xf32>) -> tensor<1xf32> {
    %0 = "tf.Acos"(%arg0) : (tensor<1xf32>) -> tensor<1xf32>
   func.return %0 : tensor<1xf32>
  }
})";

static constexpr char kBadMlirModuleStr[] = R"(

//      MINLOG = -8.872283911167299960540e+01 = log(2**-128)
//
// A rational function is used for |x| < 0.625.  The form
// x + x**3 P(x)/Q(x) of Cody & Waite is employed.
// Otherwise,
//      tanh(x) = sinh(x)/cosh(x) = 1  -  2/(exp(2x) + 1).
//
// ACCURACY:
//
//                      Relative error:
// arithmetic   domain     # trials      peak         rms
//    IEEE      -2,2        30000       2.5e-16     5.8e-17
//