tan(3M) Mathematical Library Functions tan(3M)
NAME
tan, tanf, tanl - tangent function
SYNOPSIS
cc [ flag... ] file... -lm [ library... ]
#include <math.h>
double tan(double x);
float tanf(float x);
long double tanl(long double x);
DESCRIPTION
These functions compute the tangent of their argument x, measured in radians.
RETURN VALUES
Upon successful completion, these functions return the tangent of x.
If x is NaN, a NaN is returned.
If x is +-0, x is returned.
If x is +-Inf, a domain error occurs and a NaN is returned.
ERRORS
These functions will fail if:
Domain Error The value of x is +-Inf.
If the integer expression (math_errhandling & MATH_ERREXCEPT) is non-zero, the invalid floating-point exception is raised.
USAGE
There are no known floating-point representations such that for a normal argument, tan(x) is either overflow or underflow.
An application wanting to check for exceptions should call feclearexcept(FE_ALL_EXCEPT) before calling these functions. On return, if
fetestexcept(FE_INVALID | FE_DIVBYZERO | FE_OVERFLOW | FE_UNDERFLOW) is non-zero, an exception has been raised. An application should
either examine the return value or check the floating point exception flags to detect exceptions.
ATTRIBUTES
See attributes(5) for descriptions of the following attributes:
+-----------------------------+-----------------------------+
| ATTRIBUTE TYPE | ATTRIBUTE VALUE |
+-----------------------------+-----------------------------+
|Interface Stability |Standard |
+-----------------------------+-----------------------------+
|MT-Level |MT-Safe |
+-----------------------------+-----------------------------+
SEE ALSO
atan(3M), feclearexcept(3M), fetestexcept(3M), isnan(3M), math.h(3HEAD), attributes(5), standards(5)
SunOS 5.10 1 Nov 2003 tan(3M)
