TAN(3M) Mathematical Library Functions TAN(3M)
tan, tanf, tanl - tangent function
c99 [ flag... ] file... -lm [ library... ]
#include <math.h>
double tan(double x);
float tanf(float x);
long double tanl(long double x);
These functions compute the tangent of their argument x, measured in
radians.
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.
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.
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.
See attributes(7) for descriptions of the following attributes:
+----------------------------+-----------------------------+
| ATTRIBUTE TYPE | ATTRIBUTE VALUE |
+----------------------------+-----------------------------+
|Interface Stability | Standard |
+----------------------------+-----------------------------+
|MT-Level | MT-Safe |
+----------------------------+-----------------------------+
math.h(3HEAD), atan(3M), feclearexcept(3M), fetestexcept(3M),
isnan(3M), attributes(7), standards(7)
SunOS 5.11 July 12, 2006 TAN(3M)
NAME
tan, tanf, tanl - tangent function
SYNOPSIS
c99 [ 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(7) for descriptions of the following attributes:
+----------------------------+-----------------------------+
| ATTRIBUTE TYPE | ATTRIBUTE VALUE |
+----------------------------+-----------------------------+
|Interface Stability | Standard |
+----------------------------+-----------------------------+
|MT-Level | MT-Safe |
+----------------------------+-----------------------------+
SEE ALSO
math.h(3HEAD), atan(3M), feclearexcept(3M), fetestexcept(3M),
isnan(3M), attributes(7), standards(7)
SunOS 5.11 July 12, 2006 TAN(3M)