Lahey/GNU Fortran

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### 8.55 `COSH` — Hyperbolic cosine function

Description:
`COSH(X)` computes the hyperbolic cosine of X.
Standard:
Fortran 77 and later, for a complex argument Fortran 2008 or later
Class:
Elemental function
Syntax:
`X = COSH(X)`
Arguments:

 X The type shall be `REAL` or `COMPLEX`.

Return value:
The return value has same type and kind as X. If X is complex, the imaginary part of the result is in radians. If X is `REAL`, the return value has a lower bound of one, \cosh (x) \geq 1.
Example:
```          program test_cosh
real(8) :: x = 1.0_8
x = cosh(x)
end program test_cosh
```

Specific names:

 Name Argument Return type Standard `COSH(X)` `REAL(4) X` `REAL(4)` Fortran 77 and later `DCOSH(X)` `REAL(8) X` `REAL(8)` Fortran 77 and later