---
layout: stdlib-reference
---
# acosh
## Description
Arc hyperbolic cosine. Returns the arc hyperbolic cosine of the specified value.
## Signature
T acosh<T>(T x)
where T : __BuiltinFloatingPointType;
vector<T, N> acosh<T, int N>(vector<T, N> x)
where T : __BuiltinFloatingPointType;
matrix<T, N, M> acosh<T, int N, int M>(matrix<T, N, M> x)
where T : __BuiltinFloatingPointType;
## Generic Parameters
#### T: [\_\_BuiltinFloatingPointType](../interfaces/0_builtinfloatingpointtype-029hm/index.html)
#### N : int
#### M : int
## Parameters
#### x : [T](acosh.html#typeparam-T)
The value.
#### x : [vector](../types/vector/index.html)\<[T](../types/vector/index.html#typeparam-T), [N](../types/vector/index.html#decl-N)\>
The value.
#### x : [matrix](../types/matrix/index.html)\<[T](../types/matrix/t-0.html), [N](../types/matrix/index.html#decl-N), [M](../types/matrix/index.html#decl-M)\>
The value.
## Return value
The arc hyperbolic cosine of the specified value.
## Availability and Requirements
Defined for the following targets:
#### hlsl
Available in all stages.
#### glsl
Available in all stages.
#### cpp
Available in all stages.
#### cuda
Available in all stages.
#### metal
Available in all stages.
#### wgsl
Available in all stages.
#### spirv
Available in all stages.