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Man Pages
ATAN(3) FreeBSD Library Functions Manual ATAN(3)

atan, atanf, atanl
arc tangent functions of one variable

Math Library (libm, -lm)

#include <math.h>

double
atan(double x);

float
atanf(float x);

long double
atanl(long double x);

The atan(), atanf(), and atanl() functions compute the principal value of the arc tangent of x.

These functions return the arc tangent in the range [-pi/2, +pi/2] radians.

acos(3), asin(3), atan2(3), cos(3), cosh(3), math(3), sin(3), sinh(3), tan(3), tanh(3)

The atan(), atanf(), and atanl() functions conform to ISO/IEC 9899:1999 (“ISO C99”).
July 31, 2008 FreeBSD 13.1-RELEASE

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