The _ACOSH returns the nonnegative arc hyperbolic cosine of x!, expressed in radians.

## Syntax

return_value! = _ACOSH(x!)

## See Also

- _D2G (degree to gradient, _D2R (degree to radian)
- _G2D (gradient to degree), _G2R (gradient to degree)
- _R2D (radian to degree), _R2G (radian to gradient)
- COS (cosine), SIN (sine), TAN (tangent)
- _ACOS (arc cosine), _ASIN (arc sine), ATN (arc tangent)
- _ASINH (arc hyperbolic sine), _ATANH (arc hyperbolic tangent)
- _ATAN2 (Compute arc tangent with two parameters)
- _HYPOT (hypotenuse) *Mathematical Operations