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| ATAN(3) | FreeBSD Library Functions Manual | ATAN(3) |
NAME
atan, atanf,
atanl —
arc tangent functions of one variable
LIBRARY
Math Library (libm, -lm)SYNOPSIS
#include <math.h>
double
atan(double
x);
float
atanf(float
x);
long double
atanl(long
double x);
DESCRIPTION
Theatan(), atanf(), and
atanl() functions compute the principal value of the
arc tangent of x.
RETURN VALUES
These functions return the arc tangent in the range [-pi/2, +pi/2] radians.SEE ALSO
acos(3), asin(3), atan2(3), cos(3), cosh(3), math(3), sin(3), sinh(3), tan(3), tanh(3)STANDARDS
Theatan(), atanf(), and
atanl() functions conform to ISO/IEC
9899:1999 (“ISO C99”).
| July 31, 2008 | FreeBSD 13.1-RELEASE |
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