tand(), tandf() - degree-valued tangent functions
double tand(double x);
float tandf(float x);
tand() is a degree-valued version of the tan() function. It returns
the tangent of x (x specified in degrees).
tand() may lose accuracy when x is far from zero.
tandf() is a float version of tand(); it takes a float argument and
returns a float result.
tand() and tandf() are not specified by any standard, but tandf() is
named in accordance with the conventions specified in the "Future
Library Directions" section of the ANSI C standard.
To use these functions, compile either with the default -Ae option or
with the -Aa and -D_HPUX_SOURCE options. Make sure your program
includes <math.h>. Link in the math library by specifying -lm on the
compiler or linker command line.
If x is NaN or +-INFINITY, tand() returns NaN.
If the correct value after rounding would be smaller in magnitude than
MINDOUBLE, tand() returns zero.
If the correct value would overflow, tand() returns +-HUGE_VAL and
sets errno to [ERANGE].
If tand() fails, errno is set to the following value.
[ERANGE] The correct value would overflow.
acosd(3M), asind(3M), atand(3M), atan2d(3M), cosd(3M), sind(3M),
tan(3M), math(5), values(5).
Hewlett-Packard Company - 1 - HP-UX Release 11i: November 2000