NAME

atan, atanf - arc tangent function of one variable

LIBRARY

Math Library (libm, -lm)

SYNOPSIS



double atan(double x)

float atanf(float x)

DESCRIPTION

The atan() and atanf() functions compute the principal value of the arc tangent of x in the range [-/2, +/2].

SEE ALSO

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

STANDARDS

The atan() functions conforms to ANSI X3.159-1989 (``ANSI C89'') .