`TAN`

— Tangent function ¶*Description*:`TAN(X)`

computes the tangent of`X`.*Standard*:Fortran 77 and later, for a complex argument Fortran 2008 or later

*Class*:Elemental function

*Syntax*:`RESULT = TAN(X)`

*Arguments*:`X`The type shall be `REAL`

or`COMPLEX`

.*Return value*:The return value has same type and kind as

`X`, and its value is in radians.*Example*:program test_tan real(8) :: x = 0.165_8 x = tan(x) end program test_tan

*Specific names*:Name Argument Return type Standard `TAN(X)`

`REAL(4) X`

`REAL(4)`

Fortran 77 and later `DTAN(X)`

`REAL(8) X`

`REAL(8)`

Fortran 77 and later *See also*:Inverse function:

`ATAN`

— Arctangent function

Degrees function:

`TAND`

— Tangent function, degrees