tan

Date:: 03-15-23

NAME

TAN, DTAN, TAND, DTAND - Compute tangent

SYNOPSIS

TAN ([X=]x)
DTAN ([X=]x)
TAND ([X=]x) (Deferred implementation)
DTAND ([X=]x) (Deferred implementation)

STANDARDS

Fortran

Fortran extensions: TAND, DTAND

DESCRIPTION

These functions evaluate y= tan(x). They are elemental intrinsic functions that accept the following argument:

x: Must be of type real. For TAN and DTAN, x must be specified in radians and is treated as modulo 2 * pi. For TAND and DTAND, x must be specified in degrees and is treated as modulo 360.

TAN and TAND are generic function names; the rest are specifics.

NOTES

The TAN and DTAN intrinsic function names can be passed as arguments; the others cannot.

The following returns occur:

TAN(x), TAND(x), DTAN(x),

and DTAND(x) all yield NaN if x is infinite or NaN.

Note: The tan() function has a Linux-equivalent name. Use the man -aname option to show all manual pages matching name within the MANPATH search path. Manual pages are displayed in the order found.

RETURN VALUES

TAN and TAND return the real tangent of their real argument.

DTAN and DTAND return the double-precision real tangent of their double-precision real argument.