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### 9.75 `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 *See also*:Inverse function: ACOSH