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### 7.47 `COSH` — Hyperbolic cosine function

Description:
`COSH(X)` computes the hyperbolic cosine of X.
Standard:
Fortran 77 and later
Class:
Elemental function
Syntax:
`X = COSH(X)`
Arguments:

 X The type shall be `REAL`.

Return value:
The return value is of type `REAL` and it is positive ( \cosh (x) \geq 0 ). For a `REAL` argument X, \cosh (x) \geq 1 . The return value is of the same kind as X.
Example:
```          program test_cosh
real(8) :: x = 1.0_8
x = cosh(x)
end program test_cosh
```

Specific names:

 Name Argument Return type Standard `DCOSH(X)` `REAL(8) X` `REAL(8)` Fortran 77 and later